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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 0.0	$ 0.0	$ 0.0
State	1.4	1.5	1.5
Deferred:
Federal	(1.5)	17.5	7.9
State	(0.2)	4.3	1.1
Total income tax (benefit) expense	$ (0.3)	$ 23.3	$ 10.5

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Amount of current federal tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current national tax expense (benefit) for non-US (United States of America) jurisdiction.

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