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Fair value measurements - Investments in Company-Sponsored Funds (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Fair Value	$ 13,301	$ 8,795
Unfunded Commitments	2,893	3,018
Hedge Funds
Investment Holdings [Line Items]
Fair Value	554	574
Unfunded Commitments	$ 0	$ 0
Hedge Funds | Minimum
Investment Holdings [Line Items]
Redemption Notice Period	30 days	30 days
Hedge Funds | Maximum
Investment Holdings [Line Items]
Redemption Notice Period	120 days	120 days
Private Equity Funds
Investment Holdings [Line Items]
Fair Value	$ 12,747	$ 8,221
Unfunded Commitments	$ 2,893	$ 3,018

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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 https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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