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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
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 |
|  | March 31, |
Numerator: |  | 2018 |  |  | 2017 |
Net income |  | $ | 140.1 |  |  | $ | 117.4 |
Less: distributed and undistributed earnings allocated to participating securities |  |  | (1.1 | ) |  |  | (1.0 | )
Net income attributable to common shareholders |  | $ | 139.0 |  |  | $ | 116.4 |
Denominator: |  |  |  |  |  |  |  |
Weighted average basic common shares outstanding |  |  | 93.6 |  |  |  | 93.4 |
Effect of dilutive securities |  |  | 0.2 |  |  |  | 0.2 |
Weighted average diluted common shares outstanding |  |  | 93.8 |  |  |  | 93.6 |
Basic income per common share |  | $ | 1.48 |  |  | $ | 1.25 |
Diluted income per common share |  | $ | 1.48 |  |  | $ | 1.24 |

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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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