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Available for Sale Debt Securities - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 07, 2022
USD ($)
tranche
Aug. 07, 2020
USD ($)
$ / shares
shares
Apr. 05, 2019
USD ($)
$ / shares
shares
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2021
USD ($)
Debt and Equity Securities, FV-NI [Line Items]                  
Long term funding partnership, amount $ 300,000,000                
Long term funding partnership, number of tranches | tranche 5                
Long term funding partnership, initial payment $ 50,000,000                
Required amount to be drawn         $ 50,000,000        
Long term funding partnership, aggregate amount         $ 200,000,000        
Long term funding partnership, expected payment               $ 125,000,000  
Installment repayments, percentage of amount drawn         1.9        
Purchase of available for sale debt securities               79,158,000 $ 35,170,000
Investment income         $ 10,919,000   $ 14,037,000 20,448,000 30,635,000
Subsequent Event                  
Debt and Equity Securities, FV-NI [Line Items]                  
Long term funding partnership, initial payment       $ 25,000,000          
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gain/(loss) on available for sale debt securities, Including noncontrolling interest                  
Debt and Equity Securities, FV-NI [Line Items]                  
Investment income         (8,000,000)   $ 13,300,000 $ 16,900,000 $ 28,800,000
MorphoSys                  
Debt and Equity Securities, FV-NI [Line Items]                  
Commitment to fund agreement         150,000,000        
Redemption price, percentage               2.2  
MorphoSys | Subsequent Event                  
Debt and Equity Securities, FV-NI [Line Items]                  
Expected proceeds from development funding bonds       $ 300,000,000          
MorphoSys | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                  
Debt and Equity Securities, FV-NI [Line Items]                  
Payment of capital         350,000,000     $ 350,000,000  
Commitment to fund agreement         $ 150,000,000        
Period of return         9 years        
Start of period of return         2 years        
Series A Preferred Stock                  
Debt and Equity Securities, FV-NI [Line Items]                  
Purchase of available for sale debt securities     $ 125,000,000            
Preferred Shares | Series A Preferred Stock                  
Debt and Equity Securities, FV-NI [Line Items]                  
Redemption price, percentage               2  
Number of shares purchased (in shares) | shares     2,495            
Price per share (in USD per share) | $ / shares     $ 50,100            
Preferred Shares | Series B Preferred Stock                  
Debt and Equity Securities, FV-NI [Line Items]                  
Number of shares purchased (in shares) | shares   3,992           1,988  
Price per share (in USD per share) | $ / shares   $ 50,100              
Purchase of available for sale debt securities   $ 200,000,000              
Preferred Shares | Redemption, Period One | Series A Preferred Stock                  
Debt and Equity Securities, FV-NI [Line Items]                  
Redemption price, percentage           2   2  
Preferred Shares | Redemption, Period Two | Series B Preferred Stock                  
Debt and Equity Securities, FV-NI [Line Items]                  
Redemption price, percentage               1.8