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Stock-Based Compensation, Stock-based Comp Expense (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stock-Based Compensation |  |
Expense incurred for stock-based compensation plans | $ 19.1 | $ 15.4
Recognized tax benefit related to stock-based compensation | 4.5 | 6.8
Excess tax benefit from option exercises | $ 2.6 | $ 5.0

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