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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Per share intrinsic value of non-vested stock granted (in dollars per share) | $ 312.83 | $ 130.89 | $ 75.73
Weighted average per share discount from market value for shares purchased (in dollars per share) | $ 50.58 | $ 22.97 | $ 17.83
Fair value of non-vested stock that vested during the period (in millions) | $ 107.5 | $ 108.5 | $ 92.0
Tax benefit recognized in Consolidated Statements of Operations (in millions) | 11.9 | 3.7 | 2.7
Cash received from options exercised and shares purchased under all share-based arrangements (in millions) | 29.6 | 14.8 | 11.3
Tax deduction realized related to stock options exercised (in millions) | 41.8 | 13.6 | 9.8
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) | $ 34.7 | $ 23.2 | $ 16.2

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