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Fair Value Measurements - Additional Information (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Transfers from Levels 1 to 2, assets $ 0
Transfers from Levels 2 to 1, assets 0
Transfers between Levels 1 and 2, liabilities 0
Transfers from Levels 2 to 1, liabilities 0
Corporate  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Transfers between Levels 2 and 3 28,200,000
Asset-backed  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Transfers between Levels 2 and 3 24,100,000
Transfers between Levels 3 and 2 126,200,000
Commercial mortgage-backed  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Transfers between Levels 2 and 3 40,100,000
Transfers between Levels 3 and 2 12,100,000
Residential mortgage-backed  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Transfers between Levels 2 and 3 $ 2,800,000