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Investments (Details 14) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
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	$ 1,524.4
Commercial mortgage loans posted as collateral associated with obligation under funding agreements with the Federal Home Loan Bank of Des Moines	$ 1,963.6

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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