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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stock-Based Compensation |  |  |  |
Expense incurred for stock-based compensation plans | $ 16.6 | $ 14.4 | $ 46.4 | $ 40.4
Recognized tax benefit related to stock-based compensation | 3.6 | 8.9 | 27.1 | 19.7
Excess tax benefit from option exercises | $ 1.6 | $ 7.0 | $ 21.3 | $ 14.1

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