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Subsequent Event - (Details) - USD ($)
$ in Thousands
 2 Months Ended 12 Months Ended
Feb. 25, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2022
Subsequent Event [Line Items]          
Number of shares repurchased (shares)   31,486,830 2,850,102 110,598  
Aggregate cost of shares repurchased   $ 1,234,294 $ 83,472 $ 2,871  
Common shares          
Subsequent Event [Line Items]          
Remaining share repurchase authorization   1,200,000      
Variable Interest Entity, Not Primary Beneficiary          
Subsequent Event [Line Items]          
Initial Coverage at Issuance   $ 6,626,664      
Subsequent Event | Common shares          
Subsequent Event [Line Items]          
Number of shares repurchased (shares) 890,180        
Aggregate cost of shares repurchased $ 41,500        
Remaining share repurchase authorization $ 1,140,000        
Subsequent Event | Bellemeade Re 2022-1 Ltd          
Subsequent Event [Line Items]          
Pool Of Underlying Mortgages, Amount         $ 6,300,000
Subsequent Event | Variable Interest Entity, Not Primary Beneficiary | Bellemeade Re 2022-1 Ltd          
Subsequent Event [Line Items]          
Initial Coverage at Issuance         315,000
Subsequent Event | Variable Interest Entity, Not Primary Beneficiary | Bellemeade Re 2022-1 Ltd | Funded By VIE          
Subsequent Event [Line Items]          
Initial Coverage at Issuance         283,500
Subsequent Event | Variable Interest Entity, Not Primary Beneficiary | Bellemeade Re 2022-1 Ltd | Directly provided capacity          
Subsequent Event [Line Items]          
Initial Coverage at Issuance         $ 33,000