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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
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).
| Year Ended December 31
| 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |
Net income | $ | 449.6 |  |  | $ | 436.8 |  |  | $ | 392.6 |
Less: distributed and undistributed earnings allocated to participating securities | (4.4 | ) |  | (5.2 | ) |  | (5.7 | )
Net income attributable to common shareholders | $ | 445.2 |  |  | $ | 431.6 |  |  | $ | 386.9 |
Denominator: |  |  |  |  |  |  |  |
Weighted average basic common shares outstanding | 93.5 |  |  | 96.6 |  |  | 97.0 |
Effect of dilutive securities | 0.2 |  |  | 0.1 |  |  | 0.1 |
Diluted common shares outstanding | 93.7 |  |  | 96.7 |  |  | 97.1 |
Basic income per common share | $ | 4.76 |  |  | $ | 4.47 |  |  | $ | 3.99 |
Diluted income per common share | $ | 4.75 |  |  | $ | 4.47 |  |  | $ | 3.99 |

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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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