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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

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