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Stock-Based Compensation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation     $ 22.2 $ 21.7
Tax benefits on stock-based compensation expense $ 0.7 $ 0.6 2.9 3.9
To be settled with stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 2.4 2.4 16.3 14.9
Employee contributions for above stock plans 2.0 2.8 5.9 6.8
Total stock-based compensation 4.4 5.2 22.2 21.7
Tax benefits on stock-based compensation expense 0.6 0.6 4.0 3.6
To be settled with stock | Tax (expense)/benefits on stock-based compensation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefits on stock-based compensation expense 0.1 0.0 (1.1) 0.3
To be settled with stock | Executive Stock Unit (ESU) Program matching contributions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 1.0 0.1 2.6 1.9
To be settled with stock | Discounts on various stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.5 0.7 2.3 2.5
To be settled with stock | Performance Stock Unit awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) (0.2) 0.3 0.0 2.2
To be settled with stock | Restricted Stock Unit awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.8 0.9 10.0 7.0
To be settled with stock | Other, primarily non-employee directors restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.3 0.4 1.4 1.3
To be settled in cash        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.4 (0.1) 0.0 1.0
To be settled in cash | Executive Stock Unit (ESU) Program matching contributions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.2 0.2 0.5 0.5
To be settled in cash | Discounts on various stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.0 0.0 0.0 0.0
To be settled in cash | Performance Stock Unit awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.2 (0.3) (0.5) 0.5
To be settled in cash | Restricted Stock Unit awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) 0.0 0.0 0.0 0.0
To be settled in cash | Other, primarily non-employee directors restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (income) $ 0.0 $ 0.0 $ 0.0 $ 0.0