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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax (benefit) expense at U.S.federal statutory rate	$ (4.0)	$ 11.5	$ (14.5)
State income tax, net of U.S. federal tax benefit	2.4	5.7	10.0
Change in valuation allowance	4.1	13.6	26.9
Net income attributable to non-controlling interests	(24.8)	(25.2)	(23.1)
Changes in measurement of uncertain tax positions	0.0	(0.1)	(0.1)
Stock option compensation	1.2	1.3	0.5
Differences related to divested facilities	(0.7)	0.1	6.0
Tax return reconciling differences	0.0	1.1	1.7
Change in effective tax rate	(0.8)	0.3	0.5
Tax Receivable Agreement liability	0.9	1.6	0.9
Goodwill impairment	4.3	0.5	8.9
Litigation settlement	(3.7)	0.0	8.6
Other	1.0	(0.9)	0.1
Total income tax (benefit) expense	$ (20.1)	$ 9.5	$ 26.4

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