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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Income Per Common Share | The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data):
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2015 |  | 2014 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |  |
Net income | $ | 114.0 |  |  | $ | 99.6 |  |  | $ | 204.8 |  |  | $ | 189.6 |
Less: distributed and undistributed earnings allocated to participating securities | (1.4 | ) |  | (1.6 | ) |  | (2.6 | ) |  | (2.9 | )
Net income attributable to common shareholders | $ | 112.6 |  |  | $ | 98.0 |  |  | $ | 202.2 |  |  | $ | 186.7 |
Denominator: |  |  |  |  |  |  |
Weighted average basic common shares outstanding | 96.8 |  |  | 96.9 |  |  | 97.0 |  |  | 96.9 |
Effect of dilutive securities | 0.1 |  |  | — |  |  | 0.1 |  |  | — |
Diluted common shares outstanding | 96.9 |  |  | 96.9 |  |  | 97.1 |  |  | 96.9 |
Basic income per common share | $ | 1.16 |  |  | $ | 1.01 |  |  | $ | 2.09 |  |  | $ | 1.93 |
Diluted income per common share | $ | 1.16 |  |  | $ | 1.01 |  |  | $ | 2.08 |  |  | $ | 1.93 |

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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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