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Fair Value Measurements - Additional Information - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) quotesPerInvestment | Dec. 31, 2020 USD ($) quotesPerInvestment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Quotes per fixed income investment | quotesPerInvestment | 3.0 | 2.6
Assets | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers in/(out) | $ (19.5) | $ 8.3
Settlements and sales | (182.2) | (64.3)
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 | 307.1 | 299.3
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 | $ 307.1 | $ 299.3

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