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Investment Securities (Details 7) (Debt securities issued by corporations, USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Investment securities
Fair value investments	$ 2,032.8	$ 2,178.0
AA
Investment securities
Fair value investments	114.2	210.0
A
Investment securities
Fair value investments	846.1	833.7
BBB
Investment securities
Fair value investments	1,050.0	1,109.1
BB
Investment securities
Fair value investments	15.6	24.5
Other rating
Investment securities
Fair value investments	$ 6.9	$ 0.7

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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