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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2015
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,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income |  | $ | 58.6 |  |  | $ | 52.2 |  |  | $ | 111.8 |  |  | $ | 85.8 |
Less: Net income attributable to participating securities |  | (1.4 | ) |  | (1.1 | ) |  | (2.6 | ) |  | (1.6 | )
Net income attributable to common shareholders - Basic |  | $ | 57.2 |  |  | $ | 51.1 |  |  | $ | 109.2 |  |  | $ | 84.2 |
Undistributed earnings reallocated to common shareholders under two step dilutive method |  | — |  |  | — |  |  | — |  |  | — |
Net income attributable to common shareholders - Dilutive |  | $ | 57.2 |  |  | $ | 51.1 |  |  | $ | 109.2 |  |  | $ | 84.2 |
Denominators |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 77.8 |  |  | 77.4 |  |  | 77.7 |  |  | 77.2 |
Less: Participating securities |  | (1.9 | ) |  | (1.6 | ) |  | (1.9 | ) |  | (1.5 | )
Weighted-average common shares outstanding |  | 75.9 |  |  | 75.8 |  |  | 75.8 |  |  | 75.7 |
Effect of dilutive securities - |  |  |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | 0.4 |  |  | 0.1 |  |  | 0.4 |  |  | 0.1 |
Diluted shares outstanding - |  |  |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 76.3 |  |  | 75.9 |  |  | 76.2 |  |  | 75.8 |
Basic EPS |  | $ | 0.75 |  |  | $ | 0.67 |  |  | $ | 1.44 |  |  | $ | 1.11 |
Diluted EPS |  | $ | 0.75 |  |  | $ | 0.67 |  |  | $ | 1.43 |  |  | $ | 1.11 |

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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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