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Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements Of Shareholders' Equity [Abstract] |  |  |
Issuance of common stock from exercise of stock options and deferred compensation plans, shares | 1,596,145 | 1,222,274 | 744,827
Cash dividends declared, per common share | $ 0.68 | $ 0.6 | $ 0.48
Tax benefit (expense) on change in retirement obligations | $ 4.2 | $ 1.7 | $ (3.5)
Tax benefit from change on derivatives designated as cash flow hedges | $ 12.5 | $ 11.9 | $ 0.1

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