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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share |
|  | Three Months Ended
|  | March 31,
(in millions, except per share data) |  | 2017 |  | 2016
Net income attributable to common shareholders |  | $ | 63.1 |  |  | $ | 55.0 |
Average basic shares outstanding |  | 59.3 |  |  | 58.2 |
Effect of dilutive stock options |  | 1.0 |  |  | 0.7 |
Average diluted shares outstanding |  | 60.3 |  |  | 58.9 |
Earnings per basic share |  | $ | 1.06 |  |  | $ | 0.95 |
Earnings per diluted share |  | $ | 1.05 |  |  | $ | 0.93 |

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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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