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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Stockholders' Equity [Abstract]
Dividend per share			$ 0.00	$ 0.00	$ 0.05
Unrecognized actuarial net losses	$ 94.8	$ 164.6	$ 78.1	$ 94.3	$ 179.4
Unrecognized actuarial net losses, tax	$ 35.1	$ 64.1	$ 26.0	$ 34.9	$ 69.7

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Tax effect on the total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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