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Earnings Per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share |
5. | Earnings Per 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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