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Income Taxes - Reconciliation of Effective Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Tax expense at statutory rate (percent) | 21.00% | 21.00% | 21.00%
Increase (decrease) in tax rate resulting from: |  |  |
State and other income taxes, net of federal tax benefit (percent) | 4.20% | 4.30% | 4.50%
Increase (decrease) in valuation allowance | 1.70% | 0.80% | (0.40%)
Government, class action, and related settlements | 0.00% | (1.20%) | 2.70%
Noncontrolling interests (percent) | (3.70%) | (3.00%) | (3.20%)
Share-based windfall tax benefits (percent) | (1.00%) | (1.00%) | (0.40%)
Other, net (percent) | (0.20%) | (0.30%) | (0.10%)
Income tax expense (percent) | 22.00% | 20.60% | 24.10%

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