Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Share based compensation expense | $ 20.1 | $ 25.0 |
| Tax benefit | (4.9) | (6.1) |
| After-tax expense | (15.2) | (18.9) |
| Stock Options [Member] | ||
| Share based compensation expense | 4.1 | 9.0 |
| Restricted Stock Units (RSUs) [Member] | ||
| Share based compensation expense | 5.8 | 10.6 |
| Phantom Share Units (PSUs) [Member] | ||
| Share based compensation expense | 9.5 | 4.4 |
| Deferred Compensation [Member] | ||
| Share based compensation expense | $ 0.7 | $ 1.0 |