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Fair Value Measurements - Additional Information - Narrative (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 USD ($) quotesPerInvestment | Dec. 31, 2022 USD ($) quotesPerInvestment | Dec. 31, 2021 USD ($) quotesPerInvestment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Quotes per fixed income investment | quotesPerInvestment | 2.8 | 2.9 | 3.0
Assets | Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Transfers in/(out) | $ (6.7) | $ 0.0 | $ (19.5)
Settlements and sales | (58.4) | (147.4) | (182.0)
Held for trading financial assets, at fair value | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Privately-held Investments, at fair value | 482.4 | 533.0 | 307.1
Held for trading financial assets, at fair value | Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Privately-held Investments, at fair value | $ 482.4 | $ 533.0 | $ 307.1

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