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Investment Securities (Debt securities issued by corporation) (Details) (Debt securities issued by corporations, USD $)
In Millions, unless otherwise specified

Jun. 30, 2013

Dec. 31, 2012

Investment securities

Fair value investments

$ 2,314.8

^[1]

$ 2,385.1

^[1]

AAA

Investment securities

Fair value investments

0

AA

Investment securities

Fair value investments

201.9

193.4

A

Investment securities

Fair value investments

1,039.6

1,061.0

BBB

Investment securities

Fair value investments

1,055.0

1,116.9

BB

Investment securities

Fair value investments

6.9

7.0

Other rating

Investment securities

Fair value investments

$ 11.4

$ 6.8

[1]	Credit ratings are assigned based on the following hierarchy: 1) Standard and Poor's Financial Services LLC ("Standard & Poor’s") and 2) Moody’s Investor Service ("Moody's").

- Definition

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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