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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Reconcilliation of Basic to Diluted 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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