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Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividends per share	$ 0.72	$ 0.60	$ 0.56
Provision for tax, pension and post retirement liability changes	$ 13.6	$ 8.7	$ 6.4
Provision for tax, derivatives and other	9.5	2.1	15.4
Retained Earnings
Dividends per share	$ 0.72	$ 0.60	$ 0.56
Accumulated Other Comprehensive Income (Loss)
Provision for tax, pension and post retirement liability changes	13.6	8.7	6.4
Provision for tax, derivatives and other	9.5	2.1	15.4
Comprehensive Income
Provision for tax, pension and post retirement liability changes	13.6	8.7	6.4
Provision for tax, derivatives and other	$ 9.5	$ 2.1	$ 15.4

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

Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. 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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