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Income Taxes (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Income Taxes    
Federal statutory income tax rate (as a percent) 21.00%  
Effective tax rate on income before provision for income taxes including income attributable to noncontrolling interests (as a percent) 29.00% 28.00%
Effective tax rate on income before provision for income taxes and noncontrolling interests (as a percent) 29.00%  
Minimum period of statute of limitations of state and foreign jurisdictions 3 years  
Maximum period of statute of limitations of state and foreign jurisdictions 5 years  
Deferred FICA tax payments reserve $ 13.7