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Quarterly Financial Information (unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Information (unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 359.2 | $ 357.8 | $ 367.4 | $ 361.2 | $ 357.5 | $ 367.5 | $ 373.2 | $ 329.9 | $ 1,445.6 | $ 1,428.1 | $ 1,274.6
Gross profit | 129.7 | 128.9 | 130.4 | 128.5 | 127.9 | 134.5 | 129.4 | 121.0 | 517.5 | 512.8 | 464.9
Net income from continuing operations | 18.4 | 18.5 | 18.2 | 15.5 | 17.2 | 23.4 | 12.7 | 11.1 | 70.6 | 64.4 | 63.1
Net income | $ 15.5 | $ 18.7 | $ 18.5 | $ 15.7 | $ 17.0 | $ 23.7 | $ 14.6 | $ 11.1 | $ 68.4 | $ 66.4 | $ 58.8
Basic |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ 0.52 | $ 0.53 | $ 0.50 | $ 0.42 | $ 0.47 | $ 0.63 | $ 0.34 | $ 0.30 | $ 1.96 | $ 1.73 | $ 1.69
Net income (loss) (in dollars per share) | $ 0.44 | $ 0.53 | $ 0.51 | $ 0.42 | $ 0.47 | $ 0.63 | $ 0.39 | $ 0.30 | $ 1.90 | $ 1.78 | $ 1.58
Diluted |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ 0.52 | $ 0.52 | $ 0.50 | $ 0.42 | $ 0.47 | $ 0.62 | $ 0.34 | $ 0.29 | $ 1.96 | $ 1.72 | $ 1.69
Net income (loss) (in dollars per share) | $ 0.44 | $ 0.53 | $ 0.51 | $ 0.42 | $ 0.47 | $ 0.63 | $ 0.39 | $ 0.29 | $ 1.90 | $ 1.78 | $ 1.57
Dividends per common share (in dollars per share) | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.44 | $ 0.44 | $ 0.44

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