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Fair Value Measurements - Fair Value Option on Consolidated VIEs and Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Commercial Mortgage Loans of Consolidated VIEs      
Fair Value Option, Quantitative Disclosures      
Interest income   $ 0.1  
Real Estate Ventures      
Fair Value Option, Quantitative Disclosures      
Fair value of assets for which fair value option was elected $ 22.7   $ 22.8
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected $ (0.1) $ 2.2