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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 |  |

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