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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-Based Compensation |  |  |  |
Expense incurred for stock-based compensation plans | $ 21.2 | $ 19.0 | $ 60.2 | $ 51.0
Recognized tax benefit related to stock-based compensation | 14.0 | 12.7 | 40.4 | 33.8
Excess tax benefit from option exercises | $ 12.3 | $ 10.7 | $ 34.3 | $ 28.1

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