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Fair value measurements - Investments in Company-Sponsored Funds (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | $ 4,905,000 |  | $ 5,518
Unfunded Commitments | 1,619,000 |  | 2,367
Hedge funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | 378,000 |  | 446
Unfunded Commitments | $ 0 |  | 0
Hedge funds | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Redemption Notice Period | 30 days | 30 days |
Hedge funds | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Redemption Notice Period | 120 days | 120 days |
Private equity funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | $ 4,527,000 |  | 5,072
Unfunded Commitments | $ 1,619,000 |  | $ 2,367

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