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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	$ 3,468,281		$ 3,515,566
Other liabilities	(1,823)		(2,742)
Debt	1,884,411		1,958,655
Long-term debt, fair value	1,900,000		1,900,000
Net Investment Income | Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	26,000	$ 30,200
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	3,468,281		3,515,566
Other liabilities	(3,004)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	157,397		157,563
Other liabilities	(517)		(515)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Direct private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	59,964		59,905
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	97,433		97,658
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	(517)		(515)
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Direct private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	59,964		59,905
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	$ 97,400		$ 97,700
U.S. Treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.40%		4.10%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.80%		5.70%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.00%		4.60%
Non-U.S. Government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.70%		4.40%
Residential Mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.30%		5.10%
Weighted average life	7 years 8 months 12 days		7 years 8 months 12 days
Commercial Mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	6.90%		8.80%
Weighted average life	2 years 7 months 6 days		2 years 2 months 12 days
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	6.90%		7.00%
Weighted average life	4 years 3 months 18 days		3 years 10 months 24 days
Short Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.10%		5.30%
Other Short Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.10%		5.30%
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
Direct private equity investments | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets	5 years
Direct private equity investments | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets	10 years

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