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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments $ 3,091,686   $ 3,091,686   $ 2,494,954
Other liabilities (1,032)   (1,032)   (5,331)
Debt 1,882,101   1,882,101   1,170,442
Long-term debt, fair value 1,800,000   1,800,000   1,100,000
Net investment income | Term loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net unrealized gains (losses) recognized in earnings 50,200 $ (64,600) 80,400 $ (70,700)  
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 3,091,686   3,091,686   2,494,954
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 171,155   171,155   166,780
Other liabilities (475)   (475)   (1,832)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity funds          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Other investments 71,155   71,155   66,780
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   100,000   100,000
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 (475)   (475)   (1,832)
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 71,155   71,155   66,780
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   $ 100,000   $ 100,000
U.S. treasuries          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 4.50%   4.50%   4.30%
Corporate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 6.40%   6.40%   6.30%
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 4.80%   4.80%   4.70%
Residential mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 5.50%   5.50%   5.40%
Weighted average life     8 years 1 month 6 days   8 years 7 months 6 days
Commercial mortgage-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 8.60%   8.60%   7.40%
Weighted average life     2 years 4 months 24 days   3 years 2 months 12 days
Asset-backed          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 7.40%   7.40%   7.40%
Weighted average life     4 years 7 months 6 days   5 years 2 months 12 days
Short term investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 5.10%   5.10%   4.00%
Other Short Term Investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Weighted average effective yield 5.10%   5.10%   4.20%
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 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