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Share Tracking Awards Plans - Expense Recognized (Details) - Share tracking award plans (STAP) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share based compensation benefit recognized in connection with the STAP        
Share-based compensation benefit before taxes $ (38.0) $ 45.8 $ (77.5) $ (116.5)
Related income tax expense 13.9 (17.1) 28.4 42.6
Share-based compensation benefit, net of taxes (24.1) 28.7 (49.1) (73.9)
Cash payments on awards exercised during the period     54.1 52.7
Cost of product sales        
Share based compensation benefit recognized in connection with the STAP        
Share-based compensation benefit before taxes (2.1) 3.5 (4.7) (8.7)
Research and development        
Share based compensation benefit recognized in connection with the STAP        
Share-based compensation benefit before taxes (8.2) 8.1 (16.9) (31.6)
Selling, general and administrative        
Share based compensation benefit recognized in connection with the STAP        
Share-based compensation benefit before taxes $ (27.7) $ 34.2 $ (55.9) $ (76.2)