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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Apr. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense $ 4.3 $ 4.6   $ 9.1 $ 9.0  
Related tax benefits 0.7 0.7   1.4 1.4  
Income tax benefit $ 1.1 $ 1.5   $ 1.7 $ 3.4  
PBRSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum exercisable (in shares)       9,184,321    
Minimum | PBRSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares vesting if targets conditions met, potential percentage     0.00%     0.00%
Maximum | PBRSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares vesting if targets conditions met, potential percentage     350.00%     200.00%