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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-Based Compensation |  |  |  |
Expense incurred for stock-based compensation plans | $ 20.0 | $ 16.6 | $ 39.0 | $ 32.0
Recognized tax benefit related to stock-based compensation | 21.8 | 14.3 | 26.4 | 21.1
Excess tax benefit from option exercises | $ 19.3 | $ 12.4 | $ 22.0 | $ 17.4

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