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Investments - Summary of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |
Realized gross gains | $ 12,576,000 | $ 750,000 |
Realized gross losses | (13,091,000) | (109,000) |
Impairment loss | (6,837,000) | $ 0 |
Fair Value |  |  |
Less than 12 months | 2,919,148,000 |  | $ 2,033,809,000
12 months or more | 526,703,000 |  | 152,687,000
Total | 3,445,851,000 |  | 2,186,496,000
Gross Unrealized Losses |  |  |
Less than 12 months | (135,406,000) |  | (28,074,000)
12 months or more | (48,895,000) |  | (5,393,000)
Total | (184,301,000) |  | (33,467,000)
U.S. Treasury securities |  |  |
Fair Value |  |  |
Less than 12 months | 303,598,000 |  | 207,122,000
12 months or more | 67,009,000 |  | 28,012,000
Total | 370,607,000 |  | 235,134,000
Gross Unrealized Losses |  |  |
Less than 12 months | (10,257,000) |  | (2,170,000)
12 months or more | (3,921,000) |  | (796,000)
Total | (14,178,000) |  | (2,966,000)
U.S. agency mortgage-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 614,532,000 |  | 582,108,000
12 months or more | 191,880,000 |  | 26,131,000
Total | 806,412,000 |  | 608,239,000
Gross Unrealized Losses |  |  |
Less than 12 months | (31,273,000) |  | (9,414,000)
12 months or more | (17,382,000) |  | (699,000)
Total | (48,655,000) |  | (10,113,000)
Municipal debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 301,894,000 |  | 91,719,000
12 months or more | 6,694,000 |  | 312,000
Total | 308,588,000 |  | 92,031,000
Gross Unrealized Losses |  |  |
Less than 12 months | (21,844,000) |  | (1,281,000)
12 months or more | (646,000) |  | (6,000)
Total | (22,490,000) |  | (1,287,000)
Non-U.S. government securities: |  |  |
Fair Value |  |  |
Less than 12 months | 16,001,000 |  | 22,986,000
12 months or more | 14,356,000 |  | 0
Total | 30,357,000 |  | 22,986,000
Gross Unrealized Losses |  |  |
Less than 12 months | (915,000) |  | (855,000)
12 months or more | (1,850,000) |  | 0
Total | (2,765,000) |  | (855,000)
Corporate debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 833,120,000 |  | 522,120,000
12 months or more | 125,507,000 |  | 46,875,000
Total | 958,627,000 |  | 568,995,000
Gross Unrealized Losses |  |  |
Less than 12 months | (42,805,000) |  | (7,200,000)
12 months or more | (15,568,000) |  | (2,265,000)
Total | (58,373,000) |  | (9,465,000)
Residential and commercial mortgage securities |  |  |
Fair Value |  |  |
Less than 12 months | 356,130,000 |  | 268,617,000
12 months or more | 91,270,000 |  | 38,256,000
Total | 447,400,000 |  | 306,873,000
Gross Unrealized Losses |  |  |
Less than 12 months | (18,432,000) |  | (5,200,000)
12 months or more | (8,982,000) |  | (1,467,000)
Total | (27,414,000) |  | (6,667,000)
Asset-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 493,873,000 |  | 339,137,000
12 months or more | 29,987,000 |  | 13,101,000
Total | 523,860,000 |  | 352,238,000
Gross Unrealized Losses |  |  |
Less than 12 months | (9,880,000) |  | (1,954,000)
12 months or more | (546,000) |  | (160,000)
Total | $ (10,426,000) |  | $ (2,114,000)

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