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Investments - Mortgage Loans (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Maximum loan to value ratio generally allowed 75.00%  
Commercial mortgage loans $ 3,565.9 [1] $ 3,397.3 [1]
Collective valuation allowance (1.2) (1.2)
Total net commercial mortgage loans $ 3,564.7 $ 3,396.1
[1] Balances do not include collective valuation allowance for losses.