Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Debt securities available-for-sale	$ 2,700.1
Equity Securities available for sale	2,722.8
Trading assets at fair value - derivatives	12.6	25.7
Liability Fair Value	(230.6)	(126.3)
Fair Value Measurements Recurring [Member]
Debt securities available-for-sale	2,700.1
Equity Securities available for sale	22.7	37.5
Trading assets at fair value - derivatives	12.6	25.7
Derivative counterparty assets at fair value	0.7	7.7
Total Assets	2,736.1	70.9
Liability Fair Value	(230.6)	(126.3)
Derivative counterparty liabilities at fair value	(136.6)	(74.5)
Total Liabilities	(367.2)	(200.8)
Fair Value Measurements Recurring [Member] \| Level 1 [Member]
Debt securities available-for-sale	0
Equity Securities available for sale	19.3	16.2
Trading assets at fair value - derivatives	0	0
Derivative counterparty assets at fair value	0	0
Total Assets	19.3	16.2
Liability Fair Value	0	0
Derivative counterparty liabilities at fair value	0	0
Total Liabilities	0	0
Fair Value Measurements Recurring [Member] \| Level 2 [Member]
Debt securities available-for-sale	2,700.1
Equity Securities available for sale	3.4	3.4
Trading assets at fair value - derivatives	12.6	25.7
Derivative counterparty assets at fair value	0.7	7.7
Total Assets	2,716.8	36.8
Liability Fair Value	(230.6)	(126.0)
Derivative counterparty liabilities at fair value	(136.6)	(74.5)
Total Liabilities	(367.2)	(200.5)
Fair Value Measurements Recurring [Member] \| Level 3 [Member]
Debt securities available-for-sale	0
Equity Securities available for sale	0	17.9
Trading assets at fair value - derivatives	0	0
Derivative counterparty assets at fair value	0	0
Total Assets	0	17.9
Liability Fair Value	0	(0.3)
Derivative counterparty liabilities at fair value	0	0
Total Liabilities	$ 0	$ (0.3)

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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