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Collaboration Agreements - Teva Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2016
Disaggregation of Revenue [Line Items]          
Revenues $ 2,048.4 $ 1,663.5 $ 5,693.9 $ 4,783.0  
Teva          
Disaggregation of Revenue [Line Items]          
Up-front payment received         $ 250.0
Revenues 57.4 $ 69.1 172.2 $ 196.6  
Revenue, performance obligation amount $ 300.6   $ 300.6