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Share-Based Compensation - Schedule of Share-Based Payment Arrangement Activity Expensed (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense, before tax $ 7.8 $ 13.6 $ 29.0 $ 38.4
Income tax benefit (1.8) (3.2) (6.9) (9.2)
Share-based compensation expense, after tax 6.0 10.4 22.1 29.2
Stock options        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense, before tax 0.0 0.1 0.0 0.4
Restricted stock units        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense, before tax 3.1 5.1 11.3 14.6
Restricted stock awards        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense, before tax 0.0 0.5 0.0 0.8
Performance based restricted share unit awards        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense, before tax 4.7 7.9 16.6 22.6
Cash-settled restricted stock        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense, before tax $ 0.0 $ 0.0 $ 1.1 $ 0.0