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Fair Value Measurements - Fair Value Option on Consolidated VIEs and Equity Method Investments (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
item
Commercial Mortgage Loans of Consolidated VIEs          
Fair Value Option, Quantitative Disclosures          
Fair value of assets for which fair value option was elected $ 10.0   $ 10.0   $ 12.4
Contractual principal amounts of assets for which the fair value option was elected 9.8   $ 9.8   $ 12.0
Number of loans which are more than 90 days past due or in nonaccrual status | item     0   0
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected (0.1) $ (0.1) $ (0.3) $ (0.4)  
Interest income 0.2 0.3 0.7 0.9  
Obligations of Consolidated VIEs          
Fair Value Option, Quantitative Disclosures          
Fair value of liabilities for which the fair value option was elected         $ 59.9
Aggregate unpaid principal amounts of obligations for which the fair value option was elected         60.0
Credit risk portion of pre-tax gain (loss) due to change in fair value of liabilities for which the fair value option was elected   (1.6) (0.1) (10.1)  
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected   (1.6) (0.1) (10.1)  
Interest expense   0.3 0.3 0.8  
Real Estate Ventures          
Fair Value Option, Quantitative Disclosures          
Fair value of assets for which fair value option was elected 34.9   34.9   36.9
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected (0.3) 0.7 1.6 1.4  
Investment Funds          
Fair Value Option, Quantitative Disclosures          
Fair value of assets for which fair value option was elected 44.0   44.0   $ 36.9
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected $ 0.4 $ (2.6) 0.6 2.5  
Dividend income     $ 1.9 $ 0.3