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Fair Value Measurements - Fair Value Option (Details)
item in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
item
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
item
Dec. 31, 2015
USD ($)
Commercial Mortgage Loans of Consolidated VIEs          
Fair Value Option, Quantitative Disclosures          
Fair value of assets for which fair value option was elected $ 15.0   $ 15.0   $ 18.3
Contractual principal amounts of assets for which the fair value option was elected 14.7   14.7   17.8
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected (0.1) $ (0.1) (0.3) $ (2.1)  
Credit risk portion of pre-tax gain (loss) due to change in fair value of assets for which the fair value option was elected $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Number of loans which are more than 90 days past due or in nonaccrual status | item 0 0 0 0  
Interest income $ 0.3 $ 0.9 $ 0.6 $ 1.5  
Obligations of Consolidated VIEs          
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 (3.5) (2.9) (8.5) (0.2)  
Fair value of liabilities for which the fair value option was elected 58.6   58.6   68.1
Aggregate unpaid principal amounts of obligations for which the fair value option was elected 60.0   60.0   78.0
Credit risk portion of pre-tax gain (loss) due to change in fair value of liabilities for which the fair value option was elected (3.5) (2.2) (8.5) (1.3)  
Interest expense 0.2 0.5 0.5 0.5  
Equity Method Investment          
Fair Value Option, Quantitative Disclosures          
Fair value of assets for which fair value option was elected 36.1   36.1   $ 35.1
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected 0.2 $ 0.2 0.7 $ 4.0  
Certain Investment Funds          
Fair Value Option, Quantitative Disclosures          
Fair value of assets for which fair value option was elected 31.0   31.0    
Pre-tax gain (loss) due to change in fair value of assets and liabilities for which the fair value option was elected 5.4   5.1    
Dividend income $ 0.0   $ 0.3