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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Mar. 31, 2020
Apr. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost     $ 7.8    
Unrecognized compensation cost, recognition period     1 year 3 months 18 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 or RSU outstanding (in dollars per share)     $ 12.51 $ 16.71 $ 32.10
Intrinsic value of PSU or RSU     $ 15.3 $ 22.6 $ 51.2
Performance based adjustment (in shares)     0    
RSUs | Share-based Payment Arrangement, Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights     33.33%    
RSUs | Share-based Payment Arrangement, Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights     33.33%    
RSUs | Share-based Payment Arrangement, Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights     33.33%    
Restricted Shares | Non-employee Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding (in shares)     88,488    
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of PSU or RSU outstanding (in dollars per share)     $ 12.51 $ 16.71 $ 32.10
Intrinsic value of PSU or RSU     $ 15.3 $ 22.6 $ 51.2
Performance based adjustment (in shares)     (40,087)    
PSUs | 2017 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised during period (in shares) 378,165        
Performance based adjustment (in shares) 40,087   (40,087)    
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