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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Apr. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense   $ 4.6 $ 5.1   $ 9.0 $ 9.0
Related tax benefits   0.7 1.3   1.4 2.3
Income tax benefit   $ 1.5 $ 1.3   $ 3.4 $ 2.0
PBRSU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum exercisable (in shares)         11,371,082  
PBRSU | Minimum            
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%    
PBRSU | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares vesting if targets conditions met, potential percentage 200.00%     350.00%