Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Share based compensation expense | $ 20.3 | $ 20.9 | $ 68.3 | $ 65.1 |
| Tax benefit | (4.9) | (5.1) | (16.5) | (15.8) |
| After-tax expense | (15.4) | (15.8) | (51.8) | (49.3) |
| Stock Options [Member] | ||||
| Share based compensation expense | 4.9 | 4.5 | 15.6 | 13.4 |
| Restricted Stock Units (RSUs) [Member] | ||||
| Share based compensation expense | 6.4 | 6.4 | 21.4 | 21.0 |
| Phantom Share Units (PSUs) [Member] | ||||
| Share based compensation expense | 8.3 | 9.1 | 29.4 | 28.2 |
| Deferred Compensation [Member] | ||||
| Share based compensation expense | $ 0.7 | $ 0.9 | $ 1.9 | $ 2.5 |