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Investments (Details 14) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Securities Posted as Collateral  
Fixed maturity securities posted as collateral for a reinsurance arrangement, derivative credit support annex (collateral) agreements and obligation under funding agreements with the Federal Home Loan Bank of Des Moines $ 1,461.7
Commercial mortgage loans posted as collateral associated with obligation under funding agreements with the Federal Home Loan Bank of Des Moines $ 1,741.4