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Investment Securities (Debt securities issued by corporation) (Details) (Debt securities issued by corporations, USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment securities
Fair value investments	$ 2,281.3	$ 2,135.1
AAA
Investment securities
Fair value investments	0	0
AA
Investment securities
Fair value investments	165.5	206.8
A
Investment securities
Fair value investments	992.8	802.8
BBB
Investment securities
Fair value investments	1,108.5	1,110.8
BB
Investment securities
Fair value investments	7.6	6.2
Other rating
Investment securities
Fair value investments	$ 6.9	$ 8.5

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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