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Stock-Based Compensation - Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Stock based compensation $ 104.5 $ 133.8 $ 83.1
Tax benefit recognized in net earnings $ 22.0 $ 28.1 $ 29.1