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Investments Troubled Debt Restructuring (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
loan
Dec. 31, 2012
loan
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings post-modification carrying value   $ 39.4  
Troubled debt restructured loans 37.5 37.5 0
Cross collateralized, cross defaulted
     
Financing Receivable, Modifications [Line Items]      
Number of troubled debt restructuring contracts   20  
Commercial mortgage loans
     
Financing Receivable, Modifications [Line Items]      
Number of troubled debt restructuring contracts   0 20
Troubled debt restructurings pre-modification carrying value   39.4  
Amount of principal repaid on troubled debt restructurings $ 1.9