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Share-Based Compensation - Allocation of Compensation Expense (Benefit) by Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-Based Compensation      
Share-based compensation expense (benefit) before tax $ 45.4 $ (26.4) $ 73.5
Share-based compensation capitalized as part of inventory 0.7 0.7 0.4
Cumulative effect of accounting change (5.1)   (5.1)
Stock Options      
Share-Based Compensation      
Share-based compensation expense (benefit) before tax 70.5 58.5 43.0
Restricted Stock Units      
Share-Based Compensation      
Share-based compensation expense (benefit) before tax 13.3 7.3 2.2
STAP awards      
Share-Based Compensation      
Share-based compensation expense (benefit) before tax (39.7) (93.4) 27.1
Employee Stock Purchase Plan      
Share-Based Compensation      
Share-based compensation expense (benefit) before tax 1.3 $ 1.2 $ 1.2
ASU 2016-09      
Share-Based Compensation      
Cumulative effect of accounting change $ (5.8)