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Investments - Securities and Letters of Credit Pledged to Lloyd's as Company's Corporate Member's Capital (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Securities and Letters of Credit Pledged [Line Items]
Letters of credit	$ 124.9
Fixed maturities, at fair value	200.3
Short-term investments, at fair value	3.6
Total securities and letters of credit pledged to Lloyd's	$ 328.8

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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