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Statement of Consolidated Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified | Total | Common Stock | Additional Paid in Capital | Retained Earnings | Common Stock Owned by Union VEBA | Treasury Stock | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 | $ 872.8 | $ 0.2 | $ 998.4 | $ 84.4 | $ (52.9) |  | $ (72.3) | $ (85.0)
Beginning balance, shares at Dec. 31, 2011 | 19,253,185 | 19,253,185 |  |  |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 76.7 |  |  | 76.7 |  |  |  |
Other comprehensive income, net of tax | 3.5 |  |  |  |  |  |  | 3.5
Release of restriction on Union VEBA shares, net of tax of $41.6 | 67.0 |  | 14.1 |  | 52.9 | [1] |  |
Issuance of non-vested shares to employees, shares |  | 92,949 |  |  |  |  |  |
Issuance of common shares to directors, shares |  | 3,930 |  |  |  |  |  |
Issuance of common shares to directors | 0.2 |  | 0.2 |  |  |  |  |
Issuance of common shares to employees upon vesting of restricted stock units and performance shares, shares |  | 11,327 |  |  |  |  |  |
Cancellation of employee non-vested shares |  | (2,355) |  |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares, shares |  | (45,801) |  |  |  |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares | (2.2) |  | (2.2) |  |  |  |  |
Cash dividends on common stock ($0.75 per share) | (14.7) |  |  | (14.7) |  |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest | 1.3 |  | 1.3 |  |  |  |  |
Amortization of unearned equity compensation | 5.2 |  | 5.2 |  |  |  |  |
Dividends on unvested equity awards that canceled | 0.5 |  |  | 0.5 |  |  |  |
Ending balance at Sep. 30, 2012 | $ 1,010.3 | $ 0.2 | $ 1,017.0 | $ 146.9 | $ 0 |  | $ (72.3) | $ (81.5)
Ending balance, shares at Sep. 30, 2012 | 19,314,195 | 19,313,235 |  |  |  |  |  |
[1] | At $24.02 per share reorganization value.

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Balance Type: | debit
Period Type: | duration