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Fair Value Measurements - Fair Value Option on Consolidated VIEs and Equity Method Investments (Details) - Real Estate Ventures - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Fair Value Option, Quantitative Disclosures |  |  |  |  |
Fair value of assets for which fair value option was elected | $ 41.2 |  | $ 41.2 |  | $ 28.5
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected | $ 3.4 | $ 2.4 | $ 12.7 | $ 2.3 |

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- Definition The fair value of commercial mortgage loans of consolidated variable interest entities and equity method investments for which the fair value option was elected. + References No definition available. + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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