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Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 2,182,479,000 |  | $ 1,993,059,000
Other liabilities | 8,515,000 |  | 10,827,000
Debt | 1,168,872,000 |  | 1,168,353,000
Long-term debt, fair value | 1,200,000,000 |  | 1,300,000,000
Net investment income | Other investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) recognized in earnings | (6,100,000) | $ 15,900,000 |
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 2,182,479,000 |  | 1,993,059,000
Other liabilities | 27,992,000 |  | 3,792,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 165,213,000 |  | 163,223,000
Other liabilities | 4,099,000 |  | 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 | 80,213,000 |  | 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 | 85,000,000 |  | 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 | 4,099,000 |  | 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 | 80,213,000 |  | 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 | 85,000,000 |  |
Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Miscellaneous other investments | $ 784,242,000 |  | $ 725,803,000
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.40% |  | 1.10%
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.50% |  | 1.20%
Non-U.S. government |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.50% |  | 1.20%
Non-U.S. government-backed corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.70% |  | 1.40%
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.90% |  | 2.80%
Agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.00% |  | 1.90%
Weighted average life | 7 years 9 months 18 days |  | 5 years 7 months 6 days
Non-agency prime residential mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.90% |  | 3.20%
Weighted average life | 6 years 8 months 12 days |  | 5 years 8 months 12 days
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.30% |  | 1.90%
Weighted average life | 4 years |  | 4 years 1 month 6 days
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.70% |  | 1.80%
Weighted average life | 5 years 7 months 6 days |  | 5 years 4 months 24 days
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 0.50% |  | 0.10%
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 | $ 238,473,000 |  | $ 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 |  | 11,394,000
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 | $ 545,769,000 |  | $ 473,112,000

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