Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	$ 46.1	$ 250.8	$ 16.4
Current State and Local Tax Expense (Benefit)	(2.2)	28.8	1.7
Current Income Tax Expense (Benefit)	43.9	279.6	18.1
Deferred Federal Income Tax Expense (Benefit)	18.1	(110.8)	133.1
Deferred State and Local Income Tax Expense (Benefit)	(5.8)	(45.2)	(10.0)
Deferred Income Tax Expense (Benefit)	12.3	(156.0)	123.1
Income Tax Expense	56.2	123.6	141.2
Og and E [Member]
Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	48.9	(141.2)	(9.0)
Current State and Local Tax Expense (Benefit)	3.7	(0.9)	9.0
Current Income Tax Expense (Benefit)	52.6	(142.1)	0.0
Deferred Federal Income Tax Expense (Benefit)	18.8	219.9	58.3
Deferred State and Local Income Tax Expense (Benefit)	(2.6)	(1.4)	(16.5)
Deferred Income Tax Expense (Benefit)	16.2	218.5	41.8
Income Tax Expense	$ 68.8	$ 76.4	$ 41.8