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Fair Value Measurements - Fair Value Option on Consolidated VIEs and Equity Method Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021
Real Estate Ventures |  |
Fair Value Option, Quantitative Disclosures |  |
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected | $ (0.1) | $ 12.6

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