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Collaboration Agreements And Other Contractual Arrangements (Details)
$ in Millions
1 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2020
USD ($)
May 17, 2019
USD ($)
Aug. 24, 2018
USD ($)
Dec. 20, 2017
pharmaceuticalProduct
Mar. 01, 2016
USD ($)
May 01, 2015
USD ($)
pharmaceuticalProduct
Dec. 31, 2017
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Research and development               $ 177.7 $ 187.4 $ 218.6  
Other products in development | May 2015 development agreement | Maximum                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Royalty Pharma contingent milestone payments $ 44.0             44.0      
Development-Stage Rx Products                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Research and development           $ 18.0          
Royalty Pharma contingent milestone payments 17.5       $ 30.0     17.5      
Business combination, number of products purchased | pharmaceuticalProduct           2          
Number of products sold | pharmaceuticalProduct       1              
Development-Stage Rx Products | Minimum                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Royalty payment period         7 years            
Development-Stage Rx Products | Maximum                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Royalty payment period         10 years            
ANDA                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Research and development             $ 2.5       $ 0.7
ANDA | Maximum                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Royalty Pharma contingent milestone payments 13.8             $ 13.8      
Developed product technology, formulations, and product rights | Generic Product Acquisition                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Purchase price $ 16.4 $ 15.7                  
Developed product technology, formulations, and product rights | ANDA | Generic Product Acquisition                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Purchase price     $ 30.4