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Share-Based Compensation - Total Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense $ 6.1 $ 5.9 $ 17.5 $ 17.8
Restricted stock units        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense 3.0 2.5 8.4 7.4
Performance share units        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense 1.9 2.3 5.7 7.3
Stock options        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense $ 1.2 $ 1.1 $ 3.4 $ 3.1