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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax expense (benefit) at U.S.federal statutory rate	$ 17.1	$ (4.0)	$ 11.5
State income tax, net of U.S. federal tax benefit	2.3	2.4	5.7
Change in valuation allowance	20.9	4.1	13.6
Net income attributable to non-controlling interests	(29.9)	(24.8)	(25.2)
Changes in measurement of uncertain tax positions	0.0	0.0	(0.1)
Stock option compensation	(1.7)	1.2	1.3
Differences related to divested facilities	(2.6)	(0.7)	0.1
Tax return reconciling differences	1.3	0.0	1.1
Change in effective tax rate	0.0	(0.8)	0.3
Tax Receivable Agreement liability	0.7	0.9	1.6
Goodwill impairment	0.0	4.3	0.5
Litigation settlement	0.0	(3.7)	0.0
Adjustments to unrealized attributes	2.3	0.0	0.0
Other	0.1	1.0	(0.9)
Total income tax expense (benefit)	$ 10.5	$ (20.1)	$ 9.5

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