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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock based compensation $ 83.1 $ 78.8 $ 61.8
Tax benefit recognized in net earnings 29.1 27.6 21.6
Windfall tax benefit, net $ 0.0 $ 0.0 $ 22.2