Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	$ 6,667,730
Other comprehensive loss	(367,273)	$ (86,080)
End of period	6,887,799
Net realized and unrealized gains on investments	369,882	51,759
Income before income taxes	732,433	296,068
Tax effect	(139,403)	(64,352)
Net income before noncontrolling interests	593,030	231,716
Total change in unrealized investment losses	(539,449)	(113,735)
Net change in period	56,272	4,050
Other comprehensive income (loss), pre-tax	(483,177)	(109,685)
Other comprehensive income (loss), tax effect	115,904	23,605
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(281,955)	(62,172)
Other comprehensive income (loss) before reclassifications	(376,864)	(94,941)
Amounts reclassified from AOCI	9,591	8,861
Other comprehensive loss	(367,273)	(86,080)
Unrealized investment gain related to noncontrolling interest	(1)	0
End of period	(649,229)	(148,252)
Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	12,141	11,216
Tax effect	(2,550)	(2,355)
Net income before noncontrolling interests	9,591	8,861
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	90,900	289,714
Other comprehensive income (loss) before reclassifications	(433,136)	(98,991)
Amounts reclassified from AOCI	9,591	8,861
Other comprehensive loss	(423,545)	(90,130)
Unrealized investment gain related to noncontrolling interest	(1)	0
End of period	(332,646)	199,584
Total change in unrealized investment losses	(539,449)	(113,735)
Unrealized investment gains, tax effect	115,904	23,605
Unrealized investment gains (losses), after-tax amounts	(423,545)	(90,130)
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	12,141	11,216
Tax effect	(2,550)	(2,355)
Net income before noncontrolling interests	9,591	8,861
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(372,855)	(351,886)
Other comprehensive income (loss) before reclassifications	56,272	4,050
Amounts reclassified from AOCI	0	0
Other comprehensive loss	56,272	4,050
Unrealized investment gain related to noncontrolling interest	0	0
End of period	(316,583)	(347,836)
Currency translation adjustment, pre-tax	56,272	4,050
Currency translation adjustment, tax effect	0	0
Net change in period	56,272	4,050
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