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Investments (Investments Pledged as Collateral) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
security
Investments [Abstract]  
Number of fixed maturity securities pledged as collateral for borrowings with the Federal Home Loan Bank of Indianapolis 27
Fixed maturity security pledged at carrying value $ 63.4
Outstanding borrowing with the Federal Home Loan Bank of Indianapolis $ 58.0