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Equity-Based Compensation Plans - Summary of Stock Award Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
RSUs And PSUs      
Number of Shares of Class A Common Stock (#)      
Outstanding, beginning of period (in shares) 5,240,000 5,356,000 4,199,000
Granted (in shares) 4,157,000 3,057,000 3,152,000
Vested (in shares) (2,368,000) (2,187,000) (1,545,000)
Forfeited (in shares) (896,000) (986,000) (450,000)
Outstanding, end of period (in shares) 6,133,000 5,240,000 5,356,000
RSUs      
Number of Shares of Class A Common Stock (#)      
Outstanding, beginning of period (in shares) 4,247,000 3,952,000  
Outstanding, end of period (in shares) 5,356,000 4,247,000 3,952,000
Weighted- Average Grant- Date Fair Value ($)      
Granted (in dollars per share) $ 70.54 $ 65.12 $ 53.77
TSR-based RSUs      
Number of Shares of Class A Common Stock (#)      
Outstanding, end of period (in shares) 349,000    
Weighted- Average Grant- Date Fair Value ($)      
Granted (in dollars per share) $ 106.14    
Financial-based PSUs granted for accounting purposes      
Number of Shares of Class A Common Stock (#)      
Outstanding, beginning of period (in shares) 401,000 505,000  
Outstanding, end of period (in shares) 223,000 401,000 505,000
Weighted- Average Grant- Date Fair Value ($)      
Not yet granted (in dollars per share) $ 66.97 $ 73.28 $ 63.18
Financial-based PSUs not yet granted for accounting purposes      
Number of Shares of Class A Common Stock (#)      
Outstanding, beginning of period (in shares) 592,000 899,000  
Outstanding, end of period (in shares) 205,000 592,000 899,000