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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		$ 2,807,438	$ 2,992,944
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(87,277)	(122,908)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		3,329,859	2,771,976
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(170,104)	(192,689)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		6,137,297	5,764,920
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(257,381)	(315,597)
Fixed maturity securities, available for sale, allowance for credit losses		59,698	64,771	$ 28,332	$ 0
United States Government Full Faith and Credit
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		22,652
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(422)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		22,652
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(422)
Fixed maturity securities, available for sale, allowance for credit losses		0	0
United States Government Sponsored Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		159,997	250,475
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(50)	(46)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0	0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		159,997	250,475
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(50)	(46)
Fixed maturity securities, available for sale, allowance for credit losses		0	0
United States Municipalities, States and Territories
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		232,070	31,802
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(8,611)	(3,887)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		8,110	868
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(11)	(1)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		240,180	32,670
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(8,622)	(3,888)
Fixed maturity securities, available for sale, allowance for credit losses		2,791	2,844	0	0
Foreign Government Obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		13,953
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(212)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		13,953
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(212)
Fixed maturity securities, available for sale, allowance for credit losses		0	0
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, allowance for credit losses		55,715	60,193	28,332	0
Corporate Securities | Finance, Insurance and Real Estate Sectors
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		360,414	109,789
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(24,862)	(1,733)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0	0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		360,414	109,789
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(24,862)	(1,733)
Corporate Securities | Manufacturing, Construction and Mining
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		139,787	0
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(4,867)	0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		18,107	19,335
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(2,045)	(1,384)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		157,894	19,335
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(6,912)	(1,384)
Corporate Securities | Utilities and Related Sectors
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		351,801	310,823
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(14,178)	(27,509)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		159,078	35,408
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(6,697)	(3,628)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		510,879	346,231
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(20,875)	(31,137)
Corporate Securities | Wholesale/Retail Trade
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		121,015	65,567
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(7,039)	(4,344)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		14,720	16,000
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(1,191)	(26)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		135,735	81,567
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(8,230)	(4,370)
Corporate Securities | Services, Media and Other
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		347,679	120,098
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(15,635)	(11,564)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		99,895	83,890
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(38,530)	(45,897)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		447,574	203,988
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(54,165)	(57,461)
Residential Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		250,527	156,016
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(2,435)	(2,384)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		52,433	13,599
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(2,356)	(1,876)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		302,960	169,615
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(4,791)	(4,260)
Fixed maturity securities, available for sale, allowance for credit losses		1,192	1,734	0	0
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		97,296	934,593
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(4,390)	(54,834)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		493,065	35,153
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(28,235)	(9,844)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		590,361	969,746
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(32,625)	(64,678)
Fixed maturity securities, available for sale, allowance for credit losses		0	0	0	0
Other Asset Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		710,247	1,013,781
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(4,576)	(16,607)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		2,484,451	2,567,723
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(91,039)	(130,033)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		3,194,698	3,581,504
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(95,615)	(146,640)
Fixed maturity securities, available for sale, allowance for credit losses		$ 0	$ 0	$ 0	$ 0
[1] (1) Unrealized losses have not been reduced to reflect the allowance for credit losses of $59.7 million and $64.8 million as of March 31, 2021 and December 31, 2020, respectively.

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