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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	$ 3,809,421		$ 3,809,421		$ 3,515,566
Other liabilities	824		824		2,742
Debt	1,960,167		1,960,167		1,958,655
Long-term debt, fair value	1,900,000		1,900,000		1,900,000
Net Investment Income | Term Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized (losses) gains recognized in earnings	(37,500)	$ 50,200	(11,400)	$ 80,400
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	3,809,421		3,809,421		3,515,566
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	141,917		141,917		157,563
Other liabilities	440		440		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	45,278		45,278		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	96,639		96,639		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	440		440		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	45,278		45,278		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	$ 96,600		$ 96,600		$ 97,700
U.S. Treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.50%		4.50%		4.10%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.90%		5.90%		5.70%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.10%		5.10%		4.60%
Non-U.S. Government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.90%		4.90%		4.40%
Residential Mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.50%		5.50%		5.10%
Weighted average life			8 years		7 years 8 months 12 days
Commercial Mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	6.60%		6.60%		8.80%
Weighted average life			3 years 9 months 18 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%		6.90%		7.00%
Weighted average life			4 years 4 months 24 days		3 years 10 months 24 days
Short Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.30%		5.30%		5.30%
Other Short Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.30%		5.30%		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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