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Acquisitions and Divestitures - Divestitures (Details)
£ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 19, 2020
USD ($)
Jun. 19, 2020
GBP (£)
Jul. 08, 2019
USD ($)
Sep. 28, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]              
Net proceeds from sale of business         $ 187.8 $ 182.5 $ 5.2
Gain (loss) on sale of business       $ 71.7 $ (20.9) $ 71.7 $ 0.0
Rosemont Pharmaceuticals | CSCI              
Business Acquisition [Line Items]              
Net proceeds from sale of business $ 195.0 £ 155.6          
Gain (loss) on sale of business (21.1)            
Foreign currency translation adjustment $ (46.4)            
Animal health | CSCA              
Business Acquisition [Line Items]              
Net proceeds from sale of business     $ 182.5        
Gain (loss) on sale of business     $ 71.7