Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract]
Tax effects on unrealized cash flow hedge gains/(losses)	$ 4.3	$ 10.1	$ 8.9
Tax effects on reclassification adjustments on cash flow hedges	(16.7)	(4.3)	(0.1)
Tax effects on unrealized gains/(losses) on securities		0.3	0.1
Tax effects on reclassification adjustments on securities		(1.2)
Tax effects on prior service cost and unrecognized actuarial assumptions	$ 23.0	$ 4.4	$ (1.4)

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Tax effect on the reclassification adjustment for losses realized upon the write-down of securities.

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- Definition

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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