Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Effective income tax	23.00%	24.60%	23.10%	24.40%
Benefit associated with the purchase of transferable federal tax credits	$ (14.3)		$ (14.3)
Income tax benefit from favorable resolution of uncertain tax positions			(13.2)
Deferred tax liabilities	353.4		353.4		$ 237.4
Gross unrecognized tax benefits	40.7		40.7		58.2
Accrued interest and penalties on unrecognized tax benefits	$ 1.8		$ 1.8		$ 6.3

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of reported income tax benefit (expense) from difference to income tax expense (benefit) computed by applying statutory federal (national) income tax rate to pretax income (loss) from continuing operation, attributable to energy-related tax credit.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax settlement.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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