Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | $ 6.6 | $ 6.7 | $ 24.1 | $ 23.5 |
| Tax benefit | (0.6) | (0.6) | (2.4) | (2.6) |
| After-tax expense | 6.0 | 6.1 | 21.7 | 20.9 |
| Stock options | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | 1.2 | 1.1 | 4.6 | 4.5 |
| Restricted Stock Units (RSUs) | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | 3.0 | 2.9 | 13.0 | 11.5 |
| Performance Share Units (PSUs) | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | $ 2.4 | $ 2.7 | $ 6.5 | $ 7.5 |