Consolidated Statements of Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	$ 7,469,237
Other comprehensive (loss) income	(97,692)	$ 185,665
End of period	7,798,512
Net realized and unrealized gains on investments	11,503	22,611
Income before income taxes	574,071	376,071
Tax effect	(132,036)	(80,342)
Net income before noncontrolling interests	442,035	295,729
Total change in unrealized investment (losses) gains	(89,297)	232,021
Net change in period	(27,570)	4,866
Other comprehensive income (loss), pre-tax	(116,867)	236,887
Other comprehensive income (loss), tax effect	19,175	(51,222)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(925,838)	(1,264,581)
Other comprehensive loss before reclassifications	(128,882)	160,081
Amounts reclassified from AOCI	31,190	25,584
Other comprehensive (loss) income	(97,692)	185,665
Unrealized investment loss related to noncontrolling interest	0	(1)
End of period	(1,023,530)	(1,078,917)
Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	39,481	32,385
Tax effect	(8,291)	(6,801)
Net income before noncontrolling interests	31,190	25,584
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(586,354)	(892,905)
Other comprehensive loss before reclassifications	(101,312)	155,215
Amounts reclassified from AOCI	31,190	25,584
Other comprehensive (loss) income	(70,122)	180,799
Unrealized investment loss related to noncontrolling interest	0	(1)
End of period	(656,476)	(712,107)
Total change in unrealized investment (losses) gains	(89,297)	232,021
Unrealized investment gains, tax effect	19,175	(51,222)
Unrealized investment gains (losses), after-tax amounts	(70,122)	180,799
Unrealized Investment Gains (Losses) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net realized and unrealized gains on investments	39,481	32,385
Tax effect	(8,291)	(6,801)
Net income before noncontrolling interests	31,190	25,584
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(339,484)	(371,676)
Other comprehensive loss before reclassifications	(27,570)	4,866
Amounts reclassified from AOCI	0	0
Other comprehensive (loss) income	(27,570)	4,866
Unrealized investment loss related to noncontrolling interest	0	0
End of period	(367,054)	(366,810)
Currency translation adjustment, pre-tax	(27,570)	4,866
Currency translation adjustment, tax effect	0	0
Net change in period	(27,570)	4,866
Currency Translation Adjustments | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	0	0
Tax effect	0	0
Net income before noncontrolling interests	$ 0	$ 0