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Net Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
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 |  | 6 Months Ended
|  | June 30, |  | June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Net earnings available to common shareholders |  | $ | 143.4 |  |  | $ | 117.0 |  |  | $ | 240.4 |  |  | $ | 191.4 |
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  | 65.7 |  |  | 67.4 |  |  | 65.8 |  |  | 67.5 |
Effect of dilutive securities - stock options |  | 0.1 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |
Effect of other share-based awards |  | 0.3 |  |  | 0.4 |  |  | 0.4 |  |  | 0.6 |
Weighted-average common shares outstanding - diluted |  | 66.1 |  |  | 68.0 |  |  | 66.4 |  |  | 68.3 |
Net earnings per share - basic |  | $ | 2.18 |  |  | $ | 1.74 |  |  | $ | 3.65 |  |  | $ | 2.83 |
Net earnings per share - diluted |  | $ | 2.17 |  |  | $ | 1.72 |  |  | $ | 3.62 |  |  | $ | 2.80 |

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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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