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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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