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Acquisitions and Divestitures - Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended 24 Months Ended
Nov. 29, 2019
Jul. 02, 2019
May 17, 2019
Apr. 01, 2019
Aug. 24, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Business Acquisition [Line Items]                    
Research and development             $ 187.4 $ 218.6 $ 167.7  
CSCA | Merck Sharp & Dohme License Agreement                    
Business Acquisition [Line Items]                    
Research and development               $ 50.0    
Brand | Branded OTC Rights of Prevacid                    
Business Acquisition [Line Items]                    
Purchase price $ 61.5                  
Capitalized intangible assets $ 61.7                  
Developed product technology, formulations, and product rights | Generic Product Acquisition                    
Business Acquisition [Line Items]                    
Purchase price   $ 49.0 $ 15.7              
Weighted-average useful life (in years) 20 years 20 years 20 years   20 years          
Developed product technology, formulations, and product rights | Budesonide Nasal Spray and Triamcinolone Nasal Spray [Member]                    
Business Acquisition [Line Items]                    
Purchase price       $ 14.0            
Weighted-average useful life (in years)       10 years            
Income from sales owned by Company (percent)       100.00%            
ANDA                    
Business Acquisition [Line Items]                    
Research and development           $ 2.5       $ 0.7
ANDA | Developed product technology, formulations, and product rights | Generic Product Acquisition                    
Business Acquisition [Line Items]                    
Purchase price         $ 30.4