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 compensation expense | $ 28.1 | $ 20.3 | $ 80.0 | $ 68.3 |
| Tax benefit | (6.8) | (4.9) | (19.4) | (16.5) |
| After-tax expense | (21.3) | (15.4) | (60.6) | (51.8) |
| Restricted Stock Units (RSUs) [Member] | ||||
| Share based compensation expense | 8.6 | 6.4 | 28.0 | 21.4 |
| Phantom Share Units (PSUs) [Member] | ||||
| Share based compensation expense | 12.4 | 8.3 | 32.7 | 29.4 |
| Deferred Compensation [Member] | ||||
| Share based compensation expense | 1.7 | 0.7 | 2.5 | 1.9 |
| Stock Options | ||||
| Share based compensation expense | $ 5.4 | $ 4.9 | $ 16.8 | $ 15.6 |