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Investments (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 982.6  
Other invested assets - other private securities [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other-than-temporary impairments   $ 6.3
Minimum [Member] | Investments with redemption restrictions [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption restriction period 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]    
Redemption restriction period 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%