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Earnings Per Share | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings per Share We compute basic earnings per share by dividing net income available to our common shareholders by the weighted average number of shares of our common stock outstanding. We appropriately weighted shares issued or reacquired during the year for the portion of the year that they were outstanding. Our diluted earnings per share reflect the impacts of our potentially dilutive securities, which include our convertible preferred stock and our equity compensation awards. 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 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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