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Stock-Based Compensation, Stock-based Comp Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Stock-Based Compensation |  |  |  |
Expense incurred for stock-based compensation plans | $ 29.5 | $ 26.9 | $ 79.9 | $ 72.4
Recognized tax benefit related to stock-based compensation | 24.5 | 41.0 | 90.3 | 74.5
Excess tax benefit from option exercises | $ 21.4 | $ 38.3 | $ 82.0 | $ 67.3

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