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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost     $ 9.5    
Unrecognized compensation cost, recognition period     1 year 7 months 6 days    
Leavers rate per year     3.00%    
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Settlement period, following third anniversary     75 days    
Intrinsic value of PSU outstanding (in dollars per share)     $ 19.30 $ 25.28 $ 25.60
Intrinsic value of PSU     $ 23.2 $ 41.2 $ 41.2
Performance based adjustment (in shares)     0 0 0
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of PSU outstanding (in dollars per share)     $ 19.30 $ 25.28 $ 25.60
Intrinsic value of PSU     $ 23.2 $ 41.2 $ 41.2
Performance based adjustment (in shares)     299,499 110,215 0
PSUs | 2016 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised during period (in shares) 977,106        
Performance based adjustment (in shares)     299,499    
PSUs | 2015 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised during period (in shares)   (557,337)      
Performance based adjustment (in shares)   110,215      
Vesting Period One | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage on each of the first, second, and third anniversary of the grant date     33.33%    
Vesting Period Two | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage on each of the first, second, and third anniversary of the grant date     33.33%    
Vesting Period Three | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage on each of the first, second, and third anniversary of the grant date     33.33%    
Non-employee Director | Restricted Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding (in shares)     24,080    
Executive Committee | Employees, Sign On | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Service period     1 year    
Executive Committee | Employees, Sign On | Vesting Period One | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Executive Committee | Employees, Sign On | Vesting Period Two | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     2 years    
Executive Committee | Employees, Sign On | Vesting Period Three | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years