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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Tax expense at U.S.federal statutory rate	$ 28.4	$ 23.2	$ 17.1
State income tax, net of U.S. federal tax benefit	0.9	6.0	2.3
Change in federal valuation allowance	21.5	29.1	20.9
Net income attributable to non-controlling interests	(30.9)	(30.2)	(29.9)
Stock option compensation	0.1	(2.5)	(1.7)
Differences related to divested facilities	(18.9)	(1.4)	(2.6)
Tax return reconciling differences	(1.0)	(1.0)	1.3
Change in effective tax rate	0.0	(0.5)	0.0
Tax Receivable Agreement liability	0.0	0.4	0.7
Adjustments to unrealized attributes	0.0	0.0	2.3
Other	(0.4)	0.2	0.1
Total income tax (benefit) expense	$ (0.3)	$ 23.3	$ 10.5

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