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Related Party Transactions - Stone Point Capital LLC (Details) $ in Thousands				3 Months Ended									12 Months Ended
	Oct. 01, 2019 USD ($)	Apr. 01, 2019 USD ($)	Oct. 01, 2018 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jul. 31, 2012 shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 06, 2013 general_partner
Related Party Transaction [Line Items]
Assumed business													$ 1,586,307	$ 1,772,104	$ 1,525,703
Adverse development cover	$ 59,000
Redeemable noncontrolling interest				$ 438,791				$ 458,543					438,791	458,543	479,606
Investments in funds				2,524,420				1,957,757					2,524,420	1,957,757
Available-for-sale, at fair value				2,041,724				151,609					2,041,724	151,609
Equities, at fair value				729,721				367,125					729,721	367,125
Cash and cash equivalents				703,085				602,096					703,085	602,096	955,150
Other assets				744,608				707,469					744,608	707,469
Other liabilities				464,014				468,129					464,014	468,129
Net realized and unrealized gains (losses)				152,664	$ 148,185	$ 269,711	$ 460,791	(158,213)	$ (57,223)	$ (54,418)	$ (143,030)		1,031,351	(412,884)	190,334
Net earnings (loss)				197,864	$ 126,559	$ 238,054	$ 365,742	(149,378)	$ (22,321)	$ (145)	$ (40,428)		928,219	(212,272)	331,799
Affiliated entity
Related Party Transaction [Line Items]
Investments in funds				1,741,400									1,741,400
Trident \| Affiliated entity
Related Party Transaction [Line Items]
Voting ordinary shares acquired (shares) \| shares												1,635,986
Number of newly elected board of directors \| general_partner																1
Number of general partners \| general_partner																4
Redeemable noncontrolling interest				420,499				439,428					420,499	439,428
Equities, at fair value				96,800									96,800
StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Equities, at fair value				121,794				57,319					121,794	57,319
Cash and cash equivalents				54,080				11,739					54,080	11,739
Other assets				10				5,216					10	5,216
Other liabilities				4,710				4,240					4,710	4,240
Interest income													8,733	7,424	5,990
Net realized and unrealized gains (losses)													26,631	207	24,684
Net earnings (loss)													35,364	7,631	$ 30,674
Starstone
Related Party Transaction [Line Items]
Assumed business	189,400
Reinsurance premium consideration	$ 189,400
Short-term Investments
Related Party Transaction [Line Items]
Available-for-sale, at fair value				128,335				0					128,335	0
Fixed maturity investments, trading				51,490				114,116					51,490	114,116
Short-term Investments \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Available-for-sale, at fair value				1,431				0					1,431	0
CLO equities
Related Party Transaction [Line Items]
Investments in funds				87,555				39,052					87,555	39,052
CLO equities \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Investments in funds				32,560				15,372					32,560	15,372
Fixed Maturities
Related Party Transaction [Line Items]
Available-for-sale, at fair value				1,913,389				151,609					1,913,389	151,609
Fixed maturity investments, trading				6,346,329				7,248,793					6,346,329	7,248,793
Fixed Maturities \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Available-for-sale, at fair value				160,303				0					160,303	0
Fixed maturity investments, trading				269,131				176,193					269,131	176,193
Hedge funds
Related Party Transaction [Line Items]
Investments in funds				1,121,904				852,584					1,121,904	852,584
Hedge funds \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Investments in funds				18,993				19,535					18,993	19,535
Fixed income funds
Related Party Transaction [Line Items]
Investments in funds				481,039				403,858					481,039	403,858
Fixed income funds \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Investments in funds				381,449				324,561					381,449	324,561
Private equity funds
Related Party Transaction [Line Items]
Investments in funds				329,885				248,628					329,885	248,628
Equities, at fair value				268,799				228,710					268,799	228,710
Private equity funds \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Investments in funds				34,858				52,925					34,858	52,925
CLO equity funds
Related Party Transaction [Line Items]
Investments in funds				87,509				37,260					87,509	37,260
CLO equity funds \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Investments in funds				87,509				37,260					87,509	37,260
Private Debt \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Investments in funds				16,312				10,387					16,312	10,387
Real estate fund \| StonePoint And Affiliated Entities
Related Party Transaction [Line Items]
Investments in funds				$ 18,106				8,025					$ 18,106	8,025
Stone Point \| Affiliated entity
Related Party Transaction [Line Items]
Voting ordinary shares acquired, percent				9.10%									9.10%
Agreement period													90 days
North Bay Shareholders \| North Bay
Related Party Transaction [Line Items]
Payments to acquire investments		$ 48,000	$ 135,000
Trident \| North Bay
Related Party Transaction [Line Items]
Payments to acquire investments			$ 53,100
Mitchell International \| Affiliated entity
Related Party Transaction [Line Items]
Investments in funds				$ 25,000				$ 25,000					$ 25,000	$ 25,000