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Stock Based Compensation - Fair Value Assumptions of Equity Instruments Other than Options (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2018
Class B Incentive Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Stock Price Volatility (as a percent) 43.90%  
Risk-free interest rate (as a percent) 2.43%  
Time to liquidity (in years) 3 years 6 months  
Expected dividend yield (as a percent) 0.00%  
Fair value of equity instruments other than options (USD per share) $ 3,480  
Discount for lack of marketability (as a percent) 27.00%  
Adjusted fair value of equity instruments other than options $ 2,540  
Class C Incentive Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Stock Price Volatility (as a percent) 43.90%  
Risk-free interest rate (as a percent) 2.40%  
Time to liquidity (in years) 3 years 4 months 24 days  
Expected dividend yield (as a percent) 0.00%  
Fair value of equity instruments other than options (USD per share) $ 3,332  
Discount for lack of marketability (as a percent) 28.00%  
Adjusted fair value of equity instruments other than options $ 2,443  
Performance-Based Restricted Stock Units Based on Stock Price Appreciation    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Stock Price Volatility (as a percent)   24.00%
Risk-free interest rate (as a percent)   2.33%
Expected dividend yield (as a percent)   1.70%
Fair value of equity instruments other than options (USD per share)   $ 141.44
Expected term (in years)   3 years
Performance-Based Restricted Stock Units Based on TSR Performance    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Stock Price Volatility (as a percent)   25.00%
Risk-free interest rate (as a percent)   2.32%
Expected dividend yield (as a percent)   1.70%
Fair value of equity instruments other than options (USD per share)   $ 171.93
Expected term (in years)   2 years 9 months 18 days