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Fair Value Measurements - Fair Value Option on Consolidated VIEs and Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Commercial Mortgage Loans of Consolidated VIEs          
Fair Value Option, Quantitative Disclosures          
Interest income   $ 0.1   $ 0.2  
Real Estate Ventures          
Fair Value Option, Quantitative Disclosures          
Fair value of assets for which fair value option was elected $ 25.4   $ 25.4   $ 22.8
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected $ 2.4 $ 0.1 $ 2.3 $ 2.3