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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividend paid, per share	$ 2.00	$ 0.00	$ 0.00
Unrecognized actuarial net losses, net of deferred taxes		$ 94.8	$ 164.6
Unrecognized actuarial net losses, tax		$ 35.1	$ 64.1
Retained Earnings
Dividend paid, per share	$ 2.00

Tax effect of the increase (decrease) in the value of the projected benefit obligation and the (increase) decrease in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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