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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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