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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	$ 2,263,164,000		$ 2,263,164,000		$ 1,993,059,000
Other liabilities	(7,525,000)		(7,525,000)		(10,827,000)
Debt	1,169,917,000		1,169,917,000		1,168,353,000
Long-term debt, fair value	1,100,000,000		1,100,000,000		1,300,000,000
Net investment income | Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	(137,400,000)	$ 900,000	(208,100,000)	$ 26,900,000
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	2,263,164,000		2,263,164,000		1,993,059,000
Other liabilities					(3,792,000)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	169,923,000		169,923,000		163,223,000
Other liabilities	(2,571,000)		(2,571,000)		(4,727,000)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	69,923,000		69,923,000		88,373,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	100,000,000		100,000,000		74,850,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	(2,571,000)		(2,571,000)		(4,727,000)
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Private equity funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	69,923,000		69,923,000		88,373,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	100,000,000		100,000,000		74,900,000
Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 958,188,000		$ 958,188,000		$ 725,803,000
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.20%		4.20%		1.10%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	6.30%		6.30%		2.60%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.40%		4.40%		1.20%
Non-U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.50%		4.50%		1.20%
Residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.30%		5.30%		2.20%
Weighted average life			8 years 6 months		5 years 7 months 6 days
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	6.50%		6.50%		1.90%
Weighted average life			3 years 3 months 18 days		4 years 1 month 6 days
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	6.60%		6.60%		1.80%
Weighted average life			5 years 4 months 24 days		5 years 4 months 24 days
Short term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.00%		3.00%		0.10%
Private credit funds | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Private credit funds | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Private credit funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 677,499,000		$ 677,499,000		$ 473,112,000
Private equity funds | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Private equity funds | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Private equity funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	280,689,000		$ 280,689,000		241,297,000
Hedge funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 0		$ 0		$ 11,394,000

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