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Net Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Calculations of Net Earnings Per Share - Basic and Diluted | The calculations of net earnings per share – basic and net earnings per share – diluted were as follows:
|  |  | 3 Months Ended
|  |  | March 31,
|  |  | 2019 |  | 2018
Net earnings available to common shareholders |  |  | $ | 53.5 |  |  | $ | 97.0 |
Weighted-average common shares outstanding (in millions) |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 60.6 |  |  | 66.3 |
Effect of dilutive securities - stock options |  |  | — |  |  | 0.2 |
Effect of other share-based awards |  |  | 0.4 |  |  | 0.4 |
Weighted-average common shares outstanding - diluted |  |  | 61.0 |  |  | 66.9 |
Net earnings per share - basic |  |  | $ | 0.88 |  |  | $ | 1.46 |
Net earnings per share - diluted |  |  | $ | 0.88 |  |  | $ | 1.45 |

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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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