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Equity-Based Compensation - Grant Date Fair Value for Awards of Performance Units Inputs (Details) - Performance Stock Units - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 08, 2019
Feb. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Valuation date price based on closing stock prices (in dollars per share)     $ 35.19 $ 34.44
Expected volatility 25.00% 34.00%    
Risk-free interest rate 2.43% 2.39%    
Term in years 2 years 9 months 21 days 2 years 10 months 2 days