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Equity-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Grant Date Fair Value for Awards of Performance Units Inputs The grant date fair values for awards of performance units granted in the three months ended March 31, 2019 and 2018, which included market-based metrics, were determined using a Monte Carlo simulation valuation methodology using the following key inputs:
 
 
2019
 
2018
Valuation date stock price based on the March 8, 2019 and February 28, 2018
 
$35.19
 
$34.44
Expected volatility
 
25
%
 
34
%
Risk-free interest rate
 
2.43
%
 
2.39
%
Term in years
 
2.81

 
2.84