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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Computation of basic and diluted net income per common share | The following table shows the computation of our basic and diluted net income per common share for the years ending December 31 (in millions, except per share amounts):
| 2014 |  | 2013 |  | 2012
Numerator: |  |  |  |  |
Net income | $ | 205.0 |  |  | $ | 169.3 |  |  | $ | 137.3 |
Denominator: |  |  |  |  |
Denominator for basic earnings per share — weighted average shares | 45.0 |  |  | 46.4 |  |  | 46.8 |
Effect of dilutive securities |  |  |  |  |
Equity compensation plans | 0.8 |  |  | 0.7 |  |  | 0.7 |
Convertible preferred stock | — |  |  | — |  |  | 0.1 |
Weighted average shares outstanding - diluted | 45.8 |  |  | 47.1 |  |  | 47.6 |
Basic earnings per share | $ | 4.55 |  |  | $ | 3.64 |  |  | $ | 2.93 |
Diluted earnings per share | $ | 4.48 |  |  | $ | 3.59 |  |  | $ | 2.88 |

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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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