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Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 02, 2020
Feb. 28, 2017
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 07, 2018
May 31, 2018
Debt Instrument [Line Items]                        
Amortization of deferred financing costs       $ 1,200,000   $ 1,300,000   $ 3,600,000 $ 3,800,000      
Remaining unamortized deferred financing costs       12,200,000 $ 12,200,000     12,200,000   $ 15,800,000    
Current portion of long-term debt       138,600,000 138,600,000     138,600,000   126,700,000    
Long-term debt, less current portion       2,453,300,000 2,453,300,000     2,453,300,000   $ 2,375,000,000.0    
Portola Pharmaceuticals, Inc.                        
Debt Instrument [Line Items]                        
Deferred tax assets, royalty debt $ 42,400                      
Repayments of debt 196,900,000                      
Credit Agreement                        
Debt Instrument [Line Items]                        
Payments of financing costs             $ 53,100,000          
Credit Agreement | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity                     $ 1,000,000,000.0  
Letters of credit, amount outstanding       1,000,000.0 1,000,000.0     1,000,000.0        
Credit Agreement | Senior Secured Term Loan | Line of Credit                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount                     $ 2,612,500,000  
Debt Instrument, quarterly payment as a percent of total borrowings                     5.00%  
Debt Instrument, Periodic Payment       (32,600,000)       (97,900,000)        
Outstanding debt       2,416,600,000 2,416,600,000     2,416,600,000        
Royalty-Based Financing Agreement | HealthCare Royalty Partners                        
Debt Instrument [Line Items]                        
Outstanding debt       $ 185,200,000 $ 185,200,000     $ 185,200,000        
Debt Instrument, Interest Rate, Effective Percentage       11.40% 11.40%     11.40%        
Interest Expense, Debt       $ 4,900,000       $ 4,900,000        
Repayments of debt       1,700,000 $ 1,700,000     1,700,000        
Current portion of long-term debt       11,700,000 11,700,000     11,700,000        
Long-term debt, less current portion       $ 173,500,000 $ 173,500,000     $ 173,500,000        
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc.                        
Debt Instrument [Line Items]                        
Outstanding debt 182,000,000.0                      
Total repayment obligation as of the acquisition date 276,900,000                      
Debt Instrument, Unamortized Discount 94,900,000                      
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc.                        
Debt Instrument [Line Items]                        
Royalty Agreement, Closing Day Payment   $ 50,000,000.0                    
Royalty Agreement, Milestone Payment Based On Regulatory Approval                       $ 100,000,000.0
Royalty Agreement, Maximum Potential Royalty Payments As A Percentage Of Funding Received   195.00%                    
Royalty Agreement, Maximum Potential Royalty Payments   $ 290,600,000                    
Repayments of debt $ 13,700,000                      
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc. | Minimum                        
Debt Instrument [Line Items]                        
Royalty Agreement, Tiered Royalty, Percent   4.20%                    
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc. | Maximum                        
Debt Instrument [Line Items]                        
Royalty Agreement, Tiered Royalty, Percent   8.50%                    
Royalty-Based Financing Agreement | Forecast [Member] | HealthCare Royalty Partners                        
Debt Instrument [Line Items]                        
Repayments of debt     $ 3,000,000.0