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Summary of Significant Accounting Policies - Revenue Recognition (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
product
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Number of disclosed commercially approved products | product 5    
Decrease in net product sales $ 2.3    
Increase in net product sales   $ 8.8  
Rebate liability reversal   13.6  
Maximum payment period for rebates and chargebacks 6 months    
Accrued rebates and chargebacks $ 51.7 54.7  
Revenue deductions, rebates and chargebacks $ 178.7 223.7 $ 241.5
Maximum payment period for prompt pay discounts to distributors 30 days    
Expiration period for right to return product 12 months    
Allowance for product returns $ (6.2) 17.5 $ 0.9
Adcirca      
Allowance for product returns $ 14.2 $ 22.4  
Minimum      
Expiration period of products from the initial sale date 24 months    
Period of accounts receivable from customers 30 days    
Minimum | Unituxin      
Expiration period of products from the initial sale date 9 months    
Maximum      
Expiration period of products from the initial sale date 36 months    
Period of accounts receivable from customers 90 days    
Maximum | Unituxin      
Expiration period of products from the initial sale date 14 months