Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | $ 6.7 | $ 6.5 | $ 16.8 | $ 16.1 |
| Tax benefit | (0.6) | (0.7) | (2.0) | (1.6) |
| After-tax expense | 6.1 | 5.8 | 14.8 | 14.5 |
| Stock options | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | 1.1 | 0.9 | 3.4 | 3.0 |
| Restricted Stock Units (RSUs) | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | 3.1 | 3.6 | 8.6 | 9.0 |
| Performance Share Units (PSUs) | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share based compensation expense (benefit) | $ 2.5 | $ 2.0 | $ 4.8 | $ 4.1 |