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Investments - Schedule of Available For Sale Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Amortized Cost	$ 5,716,954	$ 5,586,730
Fair Value
Fair Value	5,369,074	5,263,739
U.S. Treasury securities
Amortized Cost
Due in 1 year	633,987
Due after 1 but within 5 years	370,211
Due after 5 but within 10 years	38,986
Due after 10 years	14,432
Subtotal	1,057,616
Amortized Cost	1,057,616	1,014,076
Fair Value
Due in 1 year	632,624
Due after 1 but within 5 years	355,791
Due after 5 but within 10 years	35,391
Due after 10 years	12,981
Subtotal	1,036,787
Fair Value	1,036,787	996,382
U.S. agency securities
Amortized Cost
Due in 1 year	1,574
Subtotal	1,574
Amortized Cost	1,574	7,199
Fair Value
Due in 1 year	1,573
Subtotal	1,573
Fair Value	1,573	7,195
Municipal debt securities
Amortized Cost
Due in 1 year	6,934
Due after 1 but within 5 years	87,058
Due after 5 but within 10 years	133,277
Due after 10 years	354,005
Subtotal	581,274
Amortized Cost	581,274	585,047
Fair Value
Due in 1 year	6,852
Due after 1 but within 5 years	84,352
Due after 5 but within 10 years	124,643
Due after 10 years	323,831
Subtotal	539,678
Fair Value	539,678	547,258
Non-U.S. government securities:
Amortized Cost
Due in 1 year	4,797
Due after 1 but within 5 years	31,909
Due after 5 but within 10 years	5,789
Due after 10 years	34,948
Subtotal	77,443
Amortized Cost	77,443	77,516
Fair Value
Due in 1 year	4,691
Due after 1 but within 5 years	30,432
Due after 5 but within 10 years	4,666
Due after 10 years	26,606
Subtotal	66,395
Fair Value	66,395	67,447
Corporate debt securities
Amortized Cost
Due in 1 year	169,890
Due after 1 but within 5 years	442,671
Due after 5 but within 10 years	552,880
Due after 10 years	146,305
Subtotal	1,311,746
Amortized Cost	1,311,746	1,380,533
Fair Value
Due in 1 year	168,104
Due after 1 but within 5 years	421,440
Due after 5 but within 10 years	509,315
Due after 10 years	120,301
Subtotal	1,219,160
Fair Value	1,219,160	1,297,055
U.S. agency mortgage-backed securities
Amortized Cost
Amortized Cost	901,725	922,907
Fair Value
Fair Value	787,285	821,346
Residential and commercial mortgage securities
Amortized Cost
Amortized Cost	558,754	571,163
Fair Value
Fair Value	506,780	517,940
Asset-backed securities
Amortized Cost
Amortized Cost	537,758	584,168
Fair Value
Fair Value	522,352	564,995
Money market funds
Amortized Cost
Amortized Cost	689,064	444,121
Fair Value
Fair Value	$ 689,064	$ 444,121

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