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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of our basic and diluted EPS available to shareholders of common stock (excluding participating securities):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income |  | $ | 71.0 |  |  | $ | 58.6 |  |  | $ | 132.1 |  |  | $ | 111.8 |
Less: Net income attributable to participating securities |  | (1.7 | ) |  | (1.4 | ) |  | (3.0 | ) |  | (2.6 | )
Net income attributable to common shareholders - Basic |  | $ | 69.3 |  |  | $ | 57.2 |  |  | $ | 129.1 |  |  | $ | 109.2 |
Undistributed earnings reallocated to common shareholders under two step dilutive method |  | — |  |  | — |  |  | — |  |  | — |
Net income attributable to common shareholders - Dilutive |  | $ | 69.3 |  |  | $ | 57.2 |  |  | $ | 129.1 |  |  | $ | 109.2 |
Denominators |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 78.3 |  |  | 77.8 |  |  | 78.1 |  |  | 77.7 |
Less: Participating securities |  | (1.8 | ) |  | (1.9 | ) |  | (1.8 | ) |  | (1.9 | )
Weighted-average common shares outstanding |  | 76.5 |  |  | 75.9 |  |  | 76.3 |  |  | 75.8 |
Effect of dilutive securities - |  |  |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | 0.4 |  |  | 0.4 |  |  | 0.4 |  |  | 0.4 |
Diluted shares outstanding - |  |  |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 76.9 |  |  | 76.3 |  |  | 76.7 |  |  | 76.2 |
Basic EPS |  | $ | 0.91 |  |  | $ | 0.75 |  |  | $ | 1.69 |  |  | $ | 1.44 |
Diluted EPS |  | $ | 0.90 |  |  | $ | 0.75 |  |  | $ | 1.68 |  |  | $ | 1.43 |
Certain exercisable stock options were excluded from the computations of diluted EPS because the exercise price of these options was greater than the average period market prices. The number of stock options outstanding, which were not included in the calculation of diluted EPS, was 0.2 million at both June 30, 2016 and June 30, 2015. The exercise price related to the excluded exercisable stock options was $26.02 at both June 30, 2016 and June 30, 2015.

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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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