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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

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