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Income Taxes - Components of Income Tax Expense for Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0.0	$ 0.0	$ 0.0
State	6.3	10.1	9.5
Total current taxes	6.3	10.1	9.5
Deferred:
Federal	5.9	(287.5)	0.0
State	(0.4)	(23.2)	0.0
Total deferred taxes	5.5	(310.7)	0.0
Provision for (benefit from) income taxes	$ 11.8	$ (300.6)	$ 9.5

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