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Stock-Based Compensation - Stock-Based Compensation Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Per share intrinsic value of non-vested stock granted (in dollars per share) $ 99.24 $ 82.90 $ 88.74
Weighted average per share discount for compensation expense recognized under the 2009 ESPP (in dollars per share) $ 15.20 $ 13.00 $ 15.89
Total intrinsic value of stock options exercised (in millions) $ 0.0 $ 0.0 $ 0.5
Fair value of non-vested stock that vested during the period (in millions) 69.6 47.5 19.3
Tax benefit recognized in Consolidated Statements of Operations (in millions) 3.5 3.8 4.2
Cash received from options exercised and shares purchased under all share-based arrangements (in millions) 7.8 7.0 6.5
Tax deduction realized related to stock options exercised (in millions) 9.0 8.9 7.6
Selling, General and Administrative Expenses      
Stock-based compensation recognized in Consolidated Statements of Operations, as a component of selling, general and administrative expense (in millions) $ 11.3 $ 11.0 $ 11.9