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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
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: |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net income |  | $ | 250.7 |  |  | $ | 139.1 |  |  | $ | 624.6 |  |  | $ | 337.4 |
Less: Distributed and undistributed earnings allocated to participating securities |  |  | (1.7 | ) |  |  | (1.0 | ) |  |  | (4.9 | ) |  |  | (2.7 | )
Net income attributable to common shareholders |  | $ | 249.0 |  |  | $ | 138.1 |  |  | $ | 619.7 |  |  | $ | 334.7 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average basic common shares outstanding |  |  | 94.3 |  |  |  | 94.2 |  |  |  | 94.2 |  |  |  | 94.0 |
Effect of dilutive securities |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.4 |  |  |  | 0.4 |
Weighted average diluted common shares outstanding |  |  | 94.7 |  |  |  | 94.5 |  |  |  | 94.6 |  |  |  | 94.4 |
Basic income per common share |  | $ | 2.64 |  |  | $ | 1.47 |  |  | $ | 6.58 |  |  | $ | 3.56 |
Diluted income per common share |  | $ | 2.63 |  |  | $ | 1.46 |  |  | $ | 6.55 |  |  | $ | 3.54 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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