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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME
Decrease in pension and other post-retirement benefits, income tax	$ 4.7	$ 6.7	$ 6.3
Decrease in prior period accumulated unrealized loss, income tax	(71.4)
Unrealized gain (loss) of the period, income tax	$ (3.5)	$ 71.4

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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- 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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