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Investments - Troubled Debt Restructuring (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Cross collateralized, cross defaulted
loan
Sep. 30, 2013
Commercial mortgage loans
Sep. 30, 2013
Commercial mortgage loans
loan
Financing Receivable, Modifications [Line Items]          
Number of troubled debt restructuring contracts     20   20
Troubled debt restructurings pre-modification carrying value         $ 39.4
Troubled debt restructurings post-modification carrying value         39.4
Amount of principal repaid on troubled debt restructurings       1.9  
Troubled debt restructured loans $ 37.5 $ 0