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Income Taxes - Components of Income Tax Expense for Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 0.0	$ 0.0	$ (0.1)
State	10.1	9.5	0.8
Total current taxes	10.1	9.5	0.7
Deferred:
Federal	(287.5)	0.0	0.0
State	(23.2)	0.0	0.0
Total deferred taxes	(310.7)	0.0	0.0
(Benefit from) provision for income taxes	$ (300.6)	$ 9.5	$ 0.7

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