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Stock-Based Compensation, Stock-based Comp Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Expense incurred for stock-based compensation plans | $ 15.4 | $ 13.3 | $ 29.8 | $ 26.0
Recognized tax benefit related to stock-based compensation | 14.9 | 4.9 | 23.5 | 10.8
Excess tax benefit from option exercises | $ 12.9 | $ 3.0 | $ 19.7 | $ 7.1

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