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Schedule I. Summary of Investments Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2021 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | $ 21,442,659
Amount at Which Shown in the Balance Sheet | 21,442,659
U.S. treasuries |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 6,302,313
Fair Value | 6,247,779
Amount at Which Shown in the Balance Sheet | 6,247,779
Agencies |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 364,429
Fair Value | 361,684
Amount at Which Shown in the Balance Sheet | 361,684
Non-U.S. government |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 552,935
Fair Value | 549,613
Amount at Which Shown in the Balance Sheet | 549,613
Non-U.S. government-backed corporate |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 476,200
Fair Value | 474,848
Amount at Which Shown in the Balance Sheet | 474,848
Corporate |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 3,202,614
Fair Value | 3,214,438
Amount at Which Shown in the Balance Sheet | 3,214,438
Agency mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 721,711
Fair Value | 721,955
Amount at Which Shown in the Balance Sheet | 721,955
Non-agency mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 232,144
Fair Value | 233,346
Amount at Which Shown in the Balance Sheet | 233,346
Commercial mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 631,016
Fair Value | 634,925
Amount at Which Shown in the Balance Sheet | 634,925
Asset-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 1,069,217
Fair Value | 1,068,543
Amount at Which Shown in the Balance Sheet | 1,068,543
Fixed maturity investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost or Cost | 13,552,579
Fair Value | 13,507,131
Amount at Which Shown in the Balance Sheet | 13,507,131
Short term investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 5,298,385
Amount at Which Shown in the Balance Sheet | 5,298,385
Equity investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 546,016
Amount at Which Shown in the Balance Sheet | 546,016
Catastrophe bonds |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 1,104,034
Amount at Which Shown in the Balance Sheet | 1,104,034
Direct private equity investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 88,373
Amount at Which Shown in the Balance Sheet | 88,373
Fund investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 725,802
Amount at Which Shown in the Balance Sheet | 725,802
Term loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 74,850
Amount at Which Shown in the Balance Sheet | 74,850
Total other investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 1,993,059
Amount at Which Shown in the Balance Sheet | 1,993,059
Investments in other ventures, under equity method |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Fair Value | 98,068
Amount at Which Shown in the Balance Sheet | $ 98,068

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