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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
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 |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
Numerator: |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Net income |  | $ | 179.8 |  |  | $ | 206.7 |  |  | $ | 560.2 |  |  | $ | 533.4 |
Less: Distributed and undistributed earnings allocated to participating securities |  |  | (1.3 | ) |  |  | (1.6 | ) |  |  | (4.2 | ) |  |  | (4.1 | )
Net income attributable to common shareholders |  | $ | 178.5 |  |  | $ | 205.1 |  |  | $ | 556.0 |  |  | $ | 529.3 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average basic common shares outstanding |  |  | 93.9 |  |  |  | 93.7 |  |  |  | 93.8 |  |  |  | 93.7 |
Effect of dilutive securities |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.3 |  |  |  | 0.2 |
Weighted average diluted common shares outstanding |  |  | 94.3 |  |  |  | 94.0 |  |  |  | 94.1 |  |  |  | 93.9 |
Basic income per common share |  | $ | 1.90 |  |  | $ | 2.19 |  |  | $ | 5.93 |  |  | $ | 5.65 |
Diluted income per common share |  | $ | 1.89 |  |  | $ | 2.18 |  |  | $ | 5.91 |  |  | $ | 5.64 |

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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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