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Stock-Based Compensation - Stock-Based Compensation Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Per share intrinsic value of non-vested stock granted (in dollars per share) | $ 75.73 | $ 86.84 | $ 99.24
Weighted average per share discount for compensation expense recognized under the 2009 ESPP (in dollars per share) | $ 17.83 | $ 13.10 | $ 15.20
Fair value of non-vested stock that vested during the period (in millions) | $ 92.0 | $ 92.0 | $ 69.6
Tax benefit recognized in Consolidated Statements of Operations (in millions) | 2.7 | 3.5 | 3.5
Cash received from options exercised and shares purchased under all share-based arrangements (in millions) | 11.3 | 10.6 | 7.8
Tax deduction realized related to stock options exercised (in millions) | 9.8 | 9.0 | 9.0
Selling, General and Administrative Expenses |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation recognized in Consolidated Statements of Operations, as a component of selling, general and administrative expense (in millions) | $ 16.2 | $ 13.4 | $ 11.3

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