Investments - Schedule of Investment Funds (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Alternative Investment [Line Items]
Investment funds, unfunded commitments	$ 450,000
Capital called from investment funds	234,000
Investment funds
Alternative Investment [Line Items]
Investment funds, fair value	640,263	$ 385,038
Investment funds, unfunded commitments	449,917
Capital called from investment funds	234,000
Investment funds \| Commercial mortgage loans
Alternative Investment [Line Items]
Investment funds, fair value	423,776	227,050
Investment funds, unfunded commitments	237,631
Investment funds \| Opportunistic credit
Alternative Investment [Line Items]
Investment funds, fair value	178,215	157,461
Investment funds, unfunded commitments	$ 0
Redemption period	36 months
Initial lock period	2 years
Investment funds \| Other investments
Alternative Investment [Line Items]
Investment funds, fair value	$ 38,272	$ 527
Investment funds, unfunded commitments	$ 212,286

Alternative Investment

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- Definition

Fair Value, Investments, Entities That Calculate Net Asset Value, Redemption Restriction, Initial Lock Period In Effect

+ References

No definition available.

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- Definition

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 35
-Paragraph 54B
-URI http://asc.fasb.org/extlink&oid=122636397&loc=SL7495116-110257

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- Definition

Period when redemption restriction has been in effect for investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258

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- Definition

The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, beyond the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the long-term.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

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