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Investment Securities (Details 4) (Debt securities issued by corporations, USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investments holding table
Investments at fair value	$ 637.9	$ 758.7
AA
Investments holding table
Investments at fair value	25.0	61.9
A
Investments holding table
Investments at fair value	281.5	307.3
BBB
Investments holding table
Investments at fair value	320.2	378.2
BB
Investments holding table
Investments at fair value	7.6	6.2
Other
Investments holding table
Investments at fair value	$ 3.6	$ 5.1

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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