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Investments (Securities And Letters Of Credit Pledged To Lloyd's As The Company's Corporate Member's Capital) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Letters of credit	$ 124.9
Fixed maturities, at fair value	125.4
Short-term investments, at fair value	4.8
Total securities and letters of credit pledged to Lloyd's	$ 255.1

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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