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Net Income Per Share | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Net Income Per Share | Note 5: Net Income Per Share The following table reconciles net income and shares used in the calculation of basic net income per share to those used for diluted net income per share:
($ and shares in millions) | 2013 |  | 2012 |  | 2011
Net income, as reported, for basic net income per share | $ | 112.3 |  |  | $ | 80.7 |  |  | $ | 75.5 |
Plus: interest expense on convertible debt, net of tax | — |  |  | 2.0 |  |  | 4.3 |
Net income for diluted net income per share | $ | 112.3 |  |  | $ | 82.7 |  |  | $ | 79.8 |
Weighted average common shares outstanding | 69.6 |  |  | 68.1 |  |  | 67.3 |
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method | 1.7 |  |  | 1.1 |  |  | 0.9 |
Assumed conversion of convertible debt, based on the if-converted method | 0.1 |  |  | 2.6 |  |  | 5.8 |
Weighted average shares assuming dilution | 71.4 |  |  | 71.8 |  |  | 74.0 |
During 2013, the number of shares from stock-based compensation plans not included in the computation of diluted net income per share, because their impact was antidilutive, was immaterial. During 2012 and 2011, there were 1.0 million and 3.2 million antidilutive shares, respectively, excluded from the computation.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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