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RELATED PARTY TRANSACTIONS (Details) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Other investments		$ 829,156,000	$ 770,923,000
Ceded premiums		2,490,529,000	2,409,243,000	$ 2,251,103,000
Ceded losses and loss expenses		1,914,000,000	1,602,000,000	1,565,000,000
Insurance and reinsurance balances payable		1,092,042,000	1,349,082,000
Stone Point Group
Related Party Transaction [Line Items]
Fees paid to related party		3,000,000	3,000,000	2,000,000
NXT Capital II
Related Party Transaction [Line Items]
Other investments		7,000,000
NXT Capital III
Related Party Transaction [Line Items]
Other investments		18,000,000
NXT Capital
Related Party Transaction [Line Items]
Fees paid to related party				1,000,000
Freedom Consumer Credit Fund, LLC Series B
Related Party Transaction [Line Items]
Fees paid to related party		2,000,000	3,000,000	2,000,000
Other investments		38,000,000
Stone Point Trident Fund VIII
Related Party Transaction [Line Items]
Fees paid to related party		1,000,000	0	0
Other investments		23,000,000
Stone Point Trident VIII Co-Invest
Related Party Transaction [Line Items]
Other investments		11,000,000
Chairman
Related Party Transaction [Line Items]
Fees paid to related party		400,000	400,000	500,000
Significant influence
Related Party Transaction [Line Items]
Other investments		404,000,000	410,000,000
Harrington Re
Related Party Transaction [Line Items]
Ceded premiums		256,000,000	247,000,000	194,000,000
Ceded losses and loss expenses		187,000,000	157,000,000	142,000,000
Reinsurance recoverable on unpaid and paid losses		641,000,000	518,000,000
Insurance and reinsurance balances payable		188,000,000	159,000,000
Ventures Re
Related Party Transaction [Line Items]
Ceded premiums		0	192,000,000	182,000,000
Ceded losses and loss expenses		0	140,000,000	$ 138,000,000
Reinsurance recoverable on unpaid and paid losses		0	199,000,000
Insurance and reinsurance balances payable		$ 0	$ 46,000,000
Stone Point Group | NXT Capital
Related Party Transaction [Line Items]
Percentage ownership by related parties	43.00%
Stone Point Group | Pantheon
Related Party Transaction [Line Items]
Percentage ownership by related parties		14.50%

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Percentage of NXT Capital's ordinary shares outstanding held by Stone Point Capital.

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