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Income Taxes - Income Tax (Benefit) Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0.0	$ (0.2)	$ (0.2)
State	1.5	1.9	1.7
Deferred:
Federal	7.9	(22.2)	3.2
State	1.1	0.4	4.8
Total income tax expense (benefit)	$ 10.5	$ (20.1)	$ 9.5

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