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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	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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Effective Income Tax Rate Reconciliation, Share-based windfall tax benefits, percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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