10-K Filing

BLACK HILLS CORP /SD/ CIK: 1130464 FY 2023

Filing Information

Form Type	10-K
Accession Number	`0000950170-24-015090`
Period End Date	20231231
Filing Date	20240214
Fiscal Year	2023
Fiscal Period	FY
XBRL Instance	bkh-20231231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 95 Income Statement 60 Cash Flow Statement 104 Stockholders Equity 34 Comprehensive Income 35

Balance Sheet 95 line items

Line Item	Tag	Value	Unit	Period
Common stock, par value (usd per share)	`CommonStockParOrStatedValuePerShare`	$1.00	USD	Point-in-time
Common stock, par value (usd per share)	`CommonStockParOrStatedValuePerShare`	$1.00	USD	Point-in-time
Common stock, shares authorized	`CommonStockSharesAuthorized`	100.00M	shares	Point-in-time
Common stock, shares authorized	`CommonStockSharesAuthorized`	100.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$86.60M	USD	Point-in-time
Common stock, shares, issued	`CommonStockSharesIssued`	66.14M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$21.40M	USD	Point-in-time
Common stock, shares, issued	`CommonStockSharesIssued`	68.27M	shares	Point-in-time
Restricted cash and equivalents	`RestrictedCashAndInvestmentsCurrent`	$6.40M	USD	Point-in-time
Treasury stock, shares	`TreasuryStockCommonShares`	68,073.00	shares	Point-in-time
Restricted cash and equivalents	`RestrictedCashAndInvestmentsCurrent`	$5.60M	USD	Point-in-time
Treasury stock, shares	`TreasuryStockCommonShares`	36,726.00	shares	Point-in-time
Accounts receivable, net	`AccountsReceivableNetCurrent`	$508.20M	USD	Point-in-time
Accounts receivable, net	`AccountsReceivableNetCurrent`	$350.30M	USD	Point-in-time
Materials, supplies and fuel	`InventoryNet`	$160.90M	USD	Point-in-time
Materials, supplies and fuel	`InventoryNet`	$207.40M	USD	Point-in-time
Derivative assets, current	`DerivativeAssetsCurrent`	-	USD	Point-in-time
Derivative assets, current	`DerivativeAssetsCurrent`	$600.00K	USD	Point-in-time
Income tax receivable, net	`IncomeTaxesReceivable`	$18.50M	USD	Point-in-time
Income tax receivable, net	`IncomeTaxesReceivable`	$17.60M	USD	Point-in-time
Regulatory assets, current	`RegulatoryAssetsCurrent`	$175.70M	USD	Point-in-time
Regulatory assets, current	`RegulatoryAssetsCurrent`	$260.30M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$50.60M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$28.20M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$826.60M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$1.07B	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$8.37B	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$8.92B	USD	Point-in-time
Less accumulated depreciation and depletion	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$1.58B	USD	Point-in-time
Less accumulated depreciation and depletion	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$1.80B	USD	Point-in-time
Total property, plant and equipment, net	`PropertyPlantAndEquipmentNet`	$7.12B	USD	Point-in-time
Total property, plant and equipment, net	`PropertyPlantAndEquipmentNet`	$6.80B	USD	Point-in-time
Goodwill	`Goodwill`	$1.30B	USD	Point-in-time
Goodwill	`Goodwill`	$1.30B	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$8.40M	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$10.80M	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$11.90M	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$9.60M	USD	Point-in-time
Regulatory assets, non-current	`RegulatoryAssetsNoncurrent`	$304.40M	USD	Point-in-time
Regulatory assets, non-current	`RegulatoryAssetsNoncurrent`	$392.70M	USD	Point-in-time
Other assets, non-current	`OtherAssetsNoncurrent`	$62.20M	USD	Point-in-time
Other assets, non-current	`OtherAssetsNoncurrent`	$46.70M	USD	Point-in-time
Total other assets, non-current	`AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment`	$1.75B	USD	Point-in-time
Total other assets, non-current	`AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment`	$1.67B	USD	Point-in-time
TOTAL ASSETS	`Assets`	$9.62B	USD	Point-in-time
TOTAL ASSETS	`Assets`	$9.62B	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$186.40M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$310.00M	USD	Point-in-time
Accrued liabilities	`AccruedLiabilitiesCurrent`	$293.30M	USD	Point-in-time
Accrued liabilities	`AccruedLiabilitiesCurrent`	$243.50M	USD	Point-in-time
Derivative liabilities, current	`DerivativeLiabilitiesCurrent`	$6.50M	USD	Point-in-time
Derivative liabilities, current	`DerivativeLiabilitiesCurrent`	$6.60M	USD	Point-in-time
Regulatory liabilities, current	`RegulatoryLiabilityCurrent`	$46.00M	USD	Point-in-time
Regulatory liabilities, current	`RegulatoryLiabilityCurrent`	$98.90M	USD	Point-in-time
Notes payable	`ShortTermBorrowings`	$535.60M	USD	Point-in-time
Notes payable	`ShortTermBorrowings`	-	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$525.00M	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$600.00M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.19B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.67B	USD	Point-in-time
Long-term debt, net of current maturities	`LongTermDebtNoncurrent`	$3.80B	USD	Point-in-time
Long-term debt, net of current maturities	`LongTermDebtNoncurrent`	$3.61B	USD	Point-in-time
Deferred income tax liabilities, net	`DeferredIncomeTaxLiabilitiesNet`	$508.90M	USD	Point-in-time
Deferred income tax liabilities, net	`DeferredIncomeTaxLiabilitiesNet`	$548.00M	USD	Point-in-time
Regulatory liabilities, non-current	`RegulatoryLiabilityNoncurrent`	$472.60M	USD	Point-in-time
Regulatory liabilities, non-current	`RegulatoryLiabilityNoncurrent`	$467.70M	USD	Point-in-time
Benefit plan liabilities	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$116.70M	USD	Point-in-time
Benefit plan liabilities	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$123.90M	USD	Point-in-time
Other deferred credits and other liabilities	`OtherLiabilitiesNoncurrent`	$188.70M	USD	Point-in-time
Other deferred credits and other liabilities	`OtherLiabilitiesNoncurrent`	$156.10M	USD	Point-in-time
Total deferred credits and other liabilities	`LiabilitiesOtherThanLongtermDebtNoncurrent`	$1.25B	USD	Point-in-time
Total deferred credits and other liabilities	`LiabilitiesOtherThanLongtermDebtNoncurrent`	$1.33B	USD	Point-in-time
Commitments, contingencies and guarantees (Note 3)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments, contingencies and guarantees (Note 3)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Common stock $1.00 par value; 100,000,000 shares authorized; issued: 68,265,042 and 66,140,396, respectively	`CommonStockValue`	$66.10M	USD	Point-in-time
Common stock $1.00 par value; 100,000,000 shares authorized; issued: 68,265,042 and 66,140,396, respectively	`CommonStockValue`	$68.30M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapital`	$2.01B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapital`	$1.88B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.06B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.16B	USD	Point-in-time
Treasury stock at cost - 68,073 and 36,726, respectively	`TreasuryStockValue`	$4.10M	USD	Point-in-time
Treasury stock at cost - 68,073 and 36,726, respectively	`TreasuryStockValue`	$2.40M	USD	Point-in-time
Accumulated other comprehensive income (loss)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-20.10M	USD	Point-in-time
Accumulated other comprehensive income (loss)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-15.60M	USD	Point-in-time
Accumulated other comprehensive income (loss)	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-14.80M	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$3.22B	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$2.99B	USD	Point-in-time
Non-controlling interest	`NoncontrollingInterestInVariableInterestEntity`	$90.50M	USD	Point-in-time
Non-controlling interest	`NoncontrollingInterestInVariableInterestEntity`	$95.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.66B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.89B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.09B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.31B	USD	Point-in-time
TOTAL LIABILITIES AND TOTAL EQUITY	`LiabilitiesAndStockholdersEquity`	$9.62B	USD	Point-in-time
TOTAL LIABILITIES AND TOTAL EQUITY	`LiabilitiesAndStockholdersEquity`	$9.62B	USD	Point-in-time

Income Statement 60 line items

Line Item	Tag	Value	Unit	Period
Revenue	`Revenues`	$2.33B	USD	Annual
Revenue	`Revenues`	$2.55B	USD	Annual
Revenue	`Revenues`	$1.95B	USD	Annual
Fuel, purchased power and cost of natural gas sold	`FuelPurchasedPowerAndCostOfGasSold`	$1.23B	USD	Annual
Fuel, purchased power and cost of natural gas sold	`FuelPurchasedPowerAndCostOfGasSold`	$982.90M	USD	Annual
Fuel, purchased power and cost of natural gas sold	`FuelPurchasedPowerAndCostOfGasSold`	$741.90M	USD	Annual
Operations and maintenance	`OperatingExpenseMaintenanceOperationsandOtherCostsandExpense`	$548.40M	USD	Annual
Operations and maintenance	`OperatingExpenseMaintenanceOperationsandOtherCostsandExpense`	$552.00M	USD	Annual
Operations and maintenance	`OperatingExpenseMaintenanceOperationsandOtherCostsandExpense`	$501.70M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$236.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$256.80M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$250.90M	USD	Annual
Taxes - property and production	`TaxesExcludingIncomeAndExciseTaxes`	$60.10M	USD	Annual
Taxes - property and production	`TaxesExcludingIncomeAndExciseTaxes`	$66.70M	USD	Annual
Taxes - property and production	`TaxesExcludingIncomeAndExciseTaxes`	$66.90M	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.54B	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.86B	USD	Annual
Total operating expenses	`OperatingExpenses`	$2.10B	USD	Annual
Operating income	`OperatingIncomeLoss`	$455.20M	USD	Annual
Operating income	`OperatingIncomeLoss`	$409.40M	USD	Annual
Operating income	`OperatingIncomeLoss`	$472.70M	USD	Annual
Interest expense incurred net of amounts capitalized	`InterestCostsIncurred`	$154.10M	USD	Annual
Interest expense incurred net of amounts capitalized	`InterestCostsIncurred`	$162.60M	USD	Annual
Interest expense incurred net of amounts capitalized	`InterestCostsIncurred`	$180.00M	USD	Annual
Interest income	`InvestmentIncomeInterest`	$1.60M	USD	Annual
Interest income	`InvestmentIncomeInterest`	$12.10M	USD	Annual
Interest income	`InvestmentIncomeInterest`	$1.70M	USD	Annual
Other income (expense), net	`OtherNonoperatingIncomeExpense`	$1.40M	USD	Annual
Other income (expense), net	`OtherNonoperatingIncomeExpense`	$1.80M	USD	Annual
Other income (expense), net	`OtherNonoperatingIncomeExpense`	$-3.20M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$-171.10M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$-159.20M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$-151.00M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$258.40M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$296.00M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$301.60M	USD	Annual
Income tax (expense)	`IncomeTaxExpenseBenefit`	$25.20M	USD	Annual
Income tax (expense)	`IncomeTaxExpenseBenefit`	$25.60M	USD	Annual
Income tax (expense)	`IncomeTaxExpenseBenefit`	$7.20M	USD	Annual
Net income	`ProfitLoss`	$276.00M	USD	Annual
Net income	`ProfitLoss`	$270.80M	USD	Annual
Net income	`ProfitLoss`	$251.20M	USD	Annual
Net income attributable to non-controlling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.50M	USD	Annual
Net income attributable to non-controlling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$12.40M	USD	Annual
Net income attributable to non-controlling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$13.80M	USD	Annual
Net income available for common stock	`NetIncomeLoss`	$262.20M	USD	Annual
Net income available for common stock	`NetIncomeLoss`	$236.70M	USD	Annual
Net income available for common stock	`NetIncomeLoss`	$258.40M	USD	Annual
Earnings per share, Basic (usd per share)	`EarningsPerShareBasic`	$3.74	USD	Annual
Earnings per share, Basic (usd per share)	`EarningsPerShareBasic`	$3.98	USD	Annual
Earnings per share, Basic (usd per share)	`EarningsPerShareBasic`	$3.91	USD	Annual
Earnings per share, Diluted (usd per share)	`EarningsPerShareDiluted`	$3.97	USD	Annual
Earnings per share, Diluted (usd per share)	`EarningsPerShareDiluted`	$3.91	USD	Annual
Earnings per share, Diluted (usd per share)	`EarningsPerShareDiluted`	$3.74	USD	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	63.20M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	64.90M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	67.00M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	63.30M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	67.10M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	65.00M	shares	Annual

Cash Flow Statement 104 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$276.00M	USD	Annual
Net income	`ProfitLoss`	$270.80M	USD	Annual
Net income	`ProfitLoss`	$251.20M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$236.00M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$256.80M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$250.90M	USD	Annual
Deferred financing cost amortization	`AmortizationOfFinancingCostsAndDiscounts`	$7.00M	USD	Annual
Deferred financing cost amortization	`AmortizationOfFinancingCostsAndDiscounts`	$10.10M	USD	Annual
Deferred financing cost amortization	`AmortizationOfFinancingCostsAndDiscounts`	$9.80M	USD	Annual
Stock compensation	`ShareBasedCompensation`	$9.70M	USD	Annual
Stock compensation	`ShareBasedCompensation`	$7.00M	USD	Annual
Stock compensation	`ShareBasedCompensation`	$8.60M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$25.40M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$7.30M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$25.60M	USD	Annual
Employee benefit plans	`PensionAndOtherPostretirementBenefitExpense`	$11.50M	USD	Annual
Employee benefit plans	`PensionAndOtherPostretirementBenefitExpense`	$5.50M	USD	Annual
Employee benefit plans	`PensionAndOtherPostretirementBenefitExpense`	$9.60M	USD	Annual
Other adjustments, net	`OtherNoncashIncomeExpense`	$-2.70M	USD	Annual
Other adjustments, net	`OtherNoncashIncomeExpense`	$4.70M	USD	Annual
Other adjustments, net	`OtherNoncashIncomeExpense`	$-7.00M	USD	Annual
Materials, supplies and fuel	`IncreaseDecreaseInInventories`	$75.40M	USD	Annual
Materials, supplies and fuel	`IncreaseDecreaseInInventories`	$35.70M	USD	Annual
Materials, supplies and fuel	`IncreaseDecreaseInInventories`	$-51.40M	USD	Annual
Accounts receivable and other current assets	`IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets`	$43.20M	USD	Annual
Accounts receivable and other current assets	`IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets`	$184.50M	USD	Annual
Accounts receivable and other current assets	`IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets`	$-204.50M	USD	Annual
Accounts payable and other current liabilities	`IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities`	$89.40M	USD	Annual
Accounts payable and other current liabilities	`IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities`	$10.60M	USD	Annual
Accounts payable and other current liabilities	`IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities`	$-109.90M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$-236.80M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$-203.90M	USD	Annual
Regulatory assets	`IncreaseDecreaseInOtherRegulatoryAssets`	$514.70M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	$-9.50M	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	-	USD	Annual
Regulatory liabilities	`IncreaseDecreaseInRegulatoryLiabilities`	-	USD	Annual
Other operating activities, net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-100.00K	USD	Annual
Other operating activities, net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$27.90M	USD	Annual
Other operating activities, net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$15.10M	USD	Annual
Net cash provided by (used in) operating activities	`NetCashProvidedByUsedInOperatingActivities`	$584.80M	USD	Annual
Net cash provided by (used in) operating activities	`NetCashProvidedByUsedInOperatingActivities`	$944.40M	USD	Annual
Net cash provided by (used in) operating activities	`NetCashProvidedByUsedInOperatingActivities`	$-64.60M	USD	Annual
Property, plant and equipment additions	`PaymentsToAcquirePropertyPlantAndEquipment`	$604.40M	USD	Annual
Property, plant and equipment additions	`PaymentsToAcquirePropertyPlantAndEquipment`	$677.50M	USD	Annual
Property, plant and equipment additions	`PaymentsToAcquirePropertyPlantAndEquipment`	$555.60M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-13.30M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-500.00K	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-18.90M	USD	Annual
Net cash (used in) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-664.20M	USD	Annual
Net cash (used in) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-603.90M	USD	Annual
Net cash (used in) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-536.70M	USD	Annual
Dividends paid on common stock	`PaymentsOfDividends`	$168.10M	USD	Annual
Dividends paid on common stock	`PaymentsOfDividends`	$145.00M	USD	Annual
Dividends paid on common stock	`PaymentsOfDividends`	$156.70M	USD	Annual
Common stock issued	`ProceedsFromIssuanceOfCommonStock`	$119.00M	USD	Annual
Common stock issued	`ProceedsFromIssuanceOfCommonStock`	$90.10M	USD	Annual
Common stock issued	`ProceedsFromIssuanceOfCommonStock`	$118.30M	USD	Annual
Term Loan - borrowings	`ProceedsFromOtherShortTermDebt`	-	USD	Annual
Term Loan - borrowings	`ProceedsFromOtherShortTermDebt`	$800.00M	USD	Annual
Term Loan - borrowings	`ProceedsFromOtherShortTermDebt`	-	USD	Annual
Term Loan - repayments	`RepaymentsOfOtherShortTermDebt`	-	USD	Annual
Term Loan - repayments	`RepaymentsOfOtherShortTermDebt`	$800.00M	USD	Annual
Term Loan - repayments	`RepaymentsOfOtherShortTermDebt`	-	USD	Annual
Net borrowings (payments) of Revolving Credit Facility and CP Program	`NetPaymentsBorrowingsOfRevolvingCreditFacilityAndCommercialPaperProgram`	$115.40M	USD	Annual
Net borrowings (payments) of Revolving Credit Facility and CP Program	`NetPaymentsBorrowingsOfRevolvingCreditFacilityAndCommercialPaperProgram`	$-535.60M	USD	Annual
Net borrowings (payments) of Revolving Credit Facility and CP Program	`NetPaymentsBorrowingsOfRevolvingCreditFacilityAndCommercialPaperProgram`	$186.10M	USD	Annual
Long-term debt - issuance	`ProceedsFromIssuanceOfLongTermDebt`	$800.00M	USD	Annual
Long-term debt - issuance	`ProceedsFromIssuanceOfLongTermDebt`	-	USD	Annual
Long-term debt - issuance	`ProceedsFromIssuanceOfLongTermDebt`	$600.00M	USD	Annual
Long-term debt - repayments	`RepaymentsOfLongTermDebt`	-	USD	Annual
Long-term debt - repayments	`RepaymentsOfLongTermDebt`	$8.40M	USD	Annual
Long-term debt - repayments	`RepaymentsOfLongTermDebt`	$525.00M	USD	Annual
Distributions to non-controlling interests	`PaymentsToMinorityShareholders`	$18.30M	USD	Annual
Distributions to non-controlling interests	`PaymentsToMinorityShareholders`	$15.70M	USD	Annual
Distributions to non-controlling interests	`PaymentsToMinorityShareholders`	$17.40M	USD	Annual
Other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-4.10M	USD	Annual
Other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-13.00M	USD	Annual
Other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$900.00K	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$731.90M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-341.70M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$32.30M	USD	Annual
Net change in cash, restricted cash and cash equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$66.00M	USD	Annual
Net change in cash, restricted cash and cash equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$13.20M	USD	Annual
Net change in cash, restricted cash and cash equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$3.10M	USD	Annual
Cash, restricted cash and cash equivalents beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$10.70M	USD	Point-in-time
Cash, restricted cash and cash equivalents beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$27.00M	USD	Point-in-time
Cash, restricted cash and cash equivalents beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$13.80M	USD	Point-in-time
Cash, restricted cash and cash equivalents beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$93.00M	USD	Point-in-time
Cash, restricted cash and cash equivalents end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$10.70M	USD	Point-in-time
Cash, restricted cash and cash equivalents end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$27.00M	USD	Point-in-time
Cash, restricted cash and cash equivalents end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$13.80M	USD	Point-in-time
Cash, restricted cash and cash equivalents end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$93.00M	USD	Point-in-time
Interest (net of amounts capitalized)	`InterestPaidNet`	$152.50M	USD	Annual
Interest (net of amounts capitalized)	`InterestPaidNet`	$142.70M	USD	Annual
Interest (net of amounts capitalized)	`InterestPaidNet`	$157.30M	USD	Annual
Income taxes	`IncomeTaxesPaidNet`	$1.00M	USD	Annual
Income taxes	`IncomeTaxesPaidNet`	$-800.00K	USD	Annual
Income taxes	`IncomeTaxesPaidNet`	$-1.50M	USD	Annual
Accrued property, plant and equipment purchases at December 31	`CapitalExpendituresIncurredButNotYetPaid`	$59.30M	USD	Annual
Accrued property, plant and equipment purchases at December 31	`CapitalExpendituresIncurredButNotYetPaid`	$68.80M	USD	Annual
Accrued property, plant and equipment purchases at December 31	`CapitalExpendituresIncurredButNotYetPaid`	$52.40M	USD	Annual
Increase in capitalized assets associated with asset retirement obligations	`NonCashRevisionToCapitalizedAssetRetirementCosts`	$14.00M	USD	Annual
Increase in capitalized assets associated with asset retirement obligations	`NonCashRevisionToCapitalizedAssetRetirementCosts`	$2.10M	USD	Annual
Increase in capitalized assets associated with asset retirement obligations	`NonCashRevisionToCapitalizedAssetRetirementCosts`	$3.80M	USD	Annual

Stockholders Equity 34 line items

Line Item	Tag	Value	Unit	Period
Dividends on common stock (usd per share)	`CommonStockDividendsPerShareCashPaid`	$2.41	USD	Annual
Dividends on common stock (usd per share)	`CommonStockDividendsPerShareCashPaid`	$2.50	USD	Annual
Dividends on common stock (usd per share)	`CommonStockDividendsPerShareCashPaid`	$2.29	USD	Annual
Beginning balance (in shares)	`CommonStockSharesOutstanding`	68.00M	shares	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.66B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.89B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.09B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.31B	USD	Point-in-time
Net income	`ProfitLoss`	$276.00M	USD	Annual
Net income	`ProfitLoss`	$270.80M	USD	Annual
Net income	`ProfitLoss`	$251.20M	USD	Annual
Other comprehensive income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$800.00K	USD	Annual
Other comprehensive income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$7.30M	USD	Annual
Other comprehensive income, net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$4.50M	USD	Annual
Dividends on common stock	`DividendsCommonStockCash`	$145.00M	USD	Annual
Dividends on common stock	`DividendsCommonStockCash`	$168.10M	USD	Annual
Dividends on common stock	`DividendsCommonStockCash`	$156.70M	USD	Annual
Share-based compensation	`StockIssuedDuringPeriodValueShareBasedCompensation`	$11.60M	USD	Annual
Share-based compensation	`StockIssuedDuringPeriodValueShareBasedCompensation`	$7.20M	USD	Annual
Share-based compensation	`StockIssuedDuringPeriodValueShareBasedCompensation`	$8.00M	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$120.00M	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$91.20M	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$119.90M	USD	Annual
Issuance costs	`AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts`	$1.70M	USD	Annual
Issuance costs	`AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts`	$1.10M	USD	Annual
Issuance costs	`AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts`	$1.20M	USD	Annual
Distributions to non-controlling interest	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$18.30M	USD	Annual
Distributions to non-controlling interest	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$15.70M	USD	Annual
Distributions to non-controlling interest	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$17.40M	USD	Annual
Ending balance (in shares)	`CommonStockSharesOutstanding`	68.00M	shares	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.66B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.89B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.09B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.31B	USD	Point-in-time

Comprehensive Income 35 line items

Line Item	Tag	Value	Unit	Period
(Tax) benefit on benefit plan liability adjustments - net gain (loss)	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$700.00K	USD	Annual
(Tax) benefit on benefit plan liability adjustments - net gain (loss)	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$1.50M	USD	Annual
Net income	`ProfitLoss`	$276.00M	USD	Annual
Net income	`ProfitLoss`	$270.80M	USD	Annual
(Tax) benefit on benefit plan liability adjustments - net gain (loss)	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	Annual
Net income	`ProfitLoss`	$251.20M	USD	Annual
(Tax) benefit on benefit plan liability adjustments - prior service costs	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	-	USD	Annual
(Tax) benefit on benefit plan liability adjustments - prior service costs	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	-	USD	Annual
(Tax) benefit on benefit plan liability adjustments - prior service costs	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	-	USD	Annual
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$700.00K	USD	Annual
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$200.00K	USD	Annual
Benefit plan liability adjustments - net gain (loss) (net of tax of $0, $(1.5), and $(0.7), respectively)	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$2.00M	USD	Annual
Benefit plan liability adjustments - net gain (loss) (net of tax of $0, $(1.5), and $(0.7), respectively)	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$4.60M	USD	Annual
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	-	USD	Annual
Benefit plan liability adjustments - net gain (loss) (net of tax of $0, $(1.5), and $(0.7), respectively)	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-300.00K	USD	Annual
Reclassification adjustment of benefit plan liability - net loss (net of tax of $0, $(0.2), and $(0.7), respectively)	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-200.00K	USD	Annual
Reclassification adjustment of benefit plan liability - net loss (net of tax of $0, $(0.2), and $(0.7), respectively)	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-500.00K	USD	Annual
Reclassification adjustment of benefit plan liability - net loss (net of tax of $0, $(0.2), and $(0.7), respectively)	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.70M	USD	Annual
Reclassification adjustment of benefit plan liability - prior service cost (net of tax of $0, $0, and $0, respectively)	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-100.00K	USD	Annual
Reclassification adjustment of benefit plan liability - prior service cost (net of tax of $0, $0, and $0, respectively)	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-100.00K	USD	Annual
Net unrealized gains (losses) on commodity derivatives (net of tax of $1.1, $0.2, and $(1.0), respectively)	`OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsTax`	$3.60M	USD	Annual
Net unrealized gains (losses) on commodity derivatives (net of tax of $1.1, $0.2, and $(1.0), respectively)	`OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsTax`	$600.00K	USD	Annual
Net unrealized gains (losses) on commodity derivatives (net of tax of $1.1, $0.2, and $(1.0), respectively)	`OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsTax`	$-3.00M	USD	Annual
Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$800.00K	USD	Annual
Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$7.30M	USD	Annual
Other comprehensive income (loss), net of tax	`OtherComprehensiveIncomeLossNetOfTax`	$4.50M	USD	Annual
Comprehensive income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$258.50M	USD	Annual
Comprehensive income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$275.30M	USD	Annual
Comprehensive income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$276.80M	USD	Annual
Less: comprehensive income attributable to non-controlling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.50M	USD	Annual
Less: comprehensive income attributable to non-controlling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$12.40M	USD	Annual
Less: comprehensive income attributable to non-controlling interest	`NetIncomeLossAttributableToNoncontrollingInterest`	$13.80M	USD	Annual
Comprehensive income available for common stock	`ComprehensiveIncomeNetOfTax`	$244.00M	USD	Annual
Comprehensive income available for common stock	`ComprehensiveIncomeNetOfTax`	$262.90M	USD	Annual
Comprehensive income available for common stock	`ComprehensiveIncomeNetOfTax`	$263.00M	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.