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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 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).
|  | Year Ended December 31, |
|  |  | 2018 |  |  |  | 2017 |  |  |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 738.0 |  |  | $ | 668.6 |  |  | $ | 449.6 |
Less: distributed and undistributed earnings allocated to participating securities |  |  | (5.7 | ) |  |  | (5.6 | ) |  |  | (4.4 | )
Net income attributable to common stockholders |  | $ | 732.3 |  |  | $ | 663.0 |  |  | $ | 445.2 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 93.7 |  |  |  | 93.5 |  |  |  | 93.5 |
Effect of dilutive securities |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.2 |
Diluted common shares outstanding |  |  | 93.9 |  |  |  | 93.7 |  |  |  | 93.7 |
Basic income per common share |  | $ | 7.82 |  |  | $ | 7.09 |  |  | $ | 4.76 |
Diluted income per common share |  | $ | 7.80 |  |  | $ | 7.07 |  |  | $ | 4.75 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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