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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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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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