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Investments - Schedule of Fixed Maturity Securities in an Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 1,555,842 $ 106,369
Less than 12 months, Gross unrealized losses $ (27,962) $ (4,171)
Less than 12 months, Number of securities | security 247 23
12 months or more, Fair value $ 29,917 $ 28,914
12 months or more, Gross unrealized losses $ (1,804) $ (388)
12 months or more, Number of securities | security 5 7
Fair value $ 1,585,759 $ 135,283
Gross unrealized losses $ (29,766) $ (4,559)
Number of securities | security 252 30
U.S. government, agencies and GSEs    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 103 $ 0
Less than 12 months, Gross unrealized losses $ (2) $ 0
Less than 12 months, Number of securities | security 1 0
12 months or more, Fair value $ 0 $ 0
12 months or more, Gross unrealized losses $ 0 $ 0
12 months or more, Number of securities | security 0 0
Fair value $ 103 $ 0
Gross unrealized losses $ (2) $ 0
Number of securities | security 1 0
State and political subdivisions    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 255,202 $ 4,717
Less than 12 months, Gross unrealized losses $ (4,456) $ (3)
Less than 12 months, Number of securities | security 47 2
12 months or more, Fair value $ 0 $ 0
12 months or more, Gross unrealized losses $ 0 $ 0
12 months or more, Number of securities | security 0 0
Fair value $ 255,202 $ 4,717
Gross unrealized losses $ (4,456) $ (3)
Number of securities | security 47 2
Non-U.S. government    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 10,560 $ 0
Less than 12 months, Gross unrealized losses $ (190) $ 0
Less than 12 months, Number of securities | security 1 0
12 months or more, Fair value $ 0 $ 0
12 months or more, Gross unrealized losses $ 0
12 months or more, Number of securities | security 0
Fair value $ 10,560 $ 0
Gross unrealized losses $ (190) $ 0
Number of securities | security 1 0
U.S. corporate    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 649,927 $ 44,296
Less than 12 months, Gross unrealized losses $ (14,300) $ (1,231)
Less than 12 months, Number of securities | security 94 8
12 months or more, Fair value $ 26,181 $ 2,886
12 months or more, Gross unrealized losses $ (1,790) $ (114)
12 months or more, Number of securities | security 4 1
Fair value $ 676,108 $ 47,182
Gross unrealized losses $ (16,090) $ (1,345)
Number of securities | security 98 9
Non-U.S. corporate    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 183,485 $ 32,533
Less than 12 months, Gross unrealized losses $ (3,465) $ (2,877)
Less than 12 months, Number of securities | security 28 8
12 months or more, Fair value $ 0 $ 0
12 months or more, Gross unrealized losses $ 0 $ 0
12 months or more, Number of securities | security 0
Fair value $ 183,485 $ 32,533
Gross unrealized losses $ (3,465) $ (2,877)
Number of securities | security 28 8
Other asset-backed    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 months, Fair value $ 456,565 $ 24,823
Less than 12 months, Gross unrealized losses $ (5,549) $ (60)
Less than 12 months, Number of securities | security 76 5
12 months or more, Fair value $ 3,736 $ 26,028
12 months or more, Gross unrealized losses $ (14) $ (274)
12 months or more, Number of securities | security 1 6
Fair value $ 460,301 $ 50,851
Gross unrealized losses $ (5,563) $ (334)
Number of securities | security 77 11