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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share |
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions, except per share data) | 2015 |  | 2014 |  | 2015 |  | 2014
Net income attributable to common shareholders | $ | 56.9 |  |  | $ | 28.1 |  |  | $ | 163.7 |  |  | $ | 136.5 |
Average basic shares outstanding | 58.1 |  |  | 59.0 |  |  | 58.0 |  |  | 58.8 |
Effect of dilutive stock options | 0.7 |  |  | 0.9 |  |  | 0.8 |  |  | 1.0 |
Average diluted shares outstanding | 58.8 |  |  | 59.9 |  |  | 58.8 |  |  | 59.7 |
Earnings per basic share | $ | 0.98 |  |  | $ | 0.48 |  |  | $ | 2.82 |  |  | $ | 2.32 |
Earnings per diluted share | $ | 0.97 |  |  | $ | 0.47 |  |  | $ | 2.78 |  |  | $ | 2.28 |

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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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