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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2012
Stockholders' Equity Note [Abstract] |
Schedule of Stockholders Equity [Table Text Block] | An analysis of shareholders’ equity for the three months ended March 31, 2012 and the year ended December 31, 2011 is shown below (share amounts not in thousands):
| Common Shares |  | Retained Earnings |  | Accumulated Other Comprehensive Loss |  | Shareholders’ Equity
| Shares |  | Amount |
Balance, December 31, 2010 | 121,023,140 |  |  | $ | 602,882 |  |  | $ | 717,058 |  |  | $ | (68,358 | ) |  | $ | 1,251,582 |
Net income | — |  |  | — |  |  | 276,005 |  |  | — |  |  | 276,005 |
Dividends ($1.52 per share) | — |  |  | — |  |  | (186,828 | ) |  | — |  |  | (186,828 | )
Issuance of shares under incentive stock plans | 1,220,731 |  |  | 13,451 |  |  | — |  |  | — |  |  | 13,451 |
Stock-based compensation | — |  |  | 16,181 |  |  | — |  |  | — |  |  | 16,181 |
Excess tax benefit on stock-based compensation | — |  |  | 5,681 |  |  | — |  |  | — |  |  | 5,681 |
Repurchase of common shares | (208,694 | ) |  | (7,909 | ) |  | — |  |  | — |  |  | (7,909 | )
Net loss from pension and postretirement plans | — |  |  | — |  |  | — |  |  | (46,263 | ) |  | (46,263 | )
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | 3,546 |  |  | 3,546 |
Joint venture cash flow hedges | — |  |  | — |  |  | — |  |  | (2,373 | ) |  | (2,373 | )
Balance, December 31, 2011 | 122,035,177 |  |  | $ | 630,286 |  |  | $ | 806,235 |  |  | $ | (113,448 | ) |  | $ | 1,323,073 |
Net income | — |  |  | — |  |  | 53,437 |  |  | — |  |  | 53,437 |
Dividends ($0.40 per share) | — |  |  | — |  |  | (48,985 | ) |  | — |  |  | (48,985 | )
Issuance of shares under incentive stock plans | 585,351 |  |  | 2,061 |  |  | — |  |  | — |  |  | 2,061 |
Stock-based compensation | — |  |  | 6,466 |  |  | — |  |  | — |  |  | 6,466 |
Excess tax benefit on stock-based compensation | — |  |  | 3,946 |  |  | — |  |  | — |  |  | 3,946 |
Repurchase of common shares | (169,757 | ) |  | (7,783 | ) |  | — |  |  | — |  |  | (7,783 | )
Amortization of gains/losses from pension and postretirement plans | — |  |  | — |  |  | — |  |  | 3,140 |  |  | 3,140 |
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | 5,825 |  |  | 5,825 |
Joint venture cash flow hedges | — |  |  | — |  |  | — |  |  | 1,205 |  |  | 1,205 |
Balance, March 31, 2012 | 122,450,771 |  |  | $ | 634,976 |  |  | $ | 810,687 |  |  | $ | (103,278 | ) |  | $ | 1,342,385 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 505 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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