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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
VIE - maximum exposure to loss   $ 984.8  
Other invested assets [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Other-than-temporary impairments $ 6.3   $ 6.3
Minimum [Member] | Investments with redemption restrictions [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Period in Effect   1 year  
Minimum [Member] | Investments without redemption restrictions [Member] | Hedge Funds [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Redemption notice period   30 days  
Gate trigger, percentage   15.00%  
Maximum [Member] | Investments with redemption restrictions [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Period in Effect   3 years  
Maximum [Member] | Investments without redemption restrictions [Member] | Hedge Funds [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Gate trigger, percentage   25.00%