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Consolidated Statement of Stockholders' Equity and Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in market value of securities available-for-sale, tax	$ 0	$ 0.1	$ 0.1
Unrecognized losses, transition obligation and prior service cost, tax	$ (1.5)	$ (5.5)	$ (4.4)

Tax effect of the gross appreciation or the gross loss, net of reclassification adjustment, in the value of the total unsold available-for-sale securities at the end of an accounting period.

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- Definition

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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