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Net Earnings Per Share | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Net Earnings Per Share | (6) Net Earnings Per Share The calculation of net earnings per share - basic and net earnings per share - diluted were as follows:
Year Ended December 31 |  | 2019 |  |  | 2018 |  |  | 2017 |
Net earnings available to common shareholders: |  | $ | 465.7 |  |  | $ | 556.7 |  |  | $ | 545.4 |
Weighted-average common shares outstanding (in millions): |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  | 59.9 |  |  |  | 64.6 |  |  |  | 67.1 |
Effect of dilutive securities - stock options |  |  | — |  |  |  | 0.1 |  |  |  | 0.2 |
Effect of other share-based awards |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.6 |
Weighted-average common shares outstanding - diluted |  |  | 60.3 |  |  |  | 65.1 |  |  |  | 67.9 |
Net earnings per share - basic |  | $ | 7.78 |  |  | $ | 8.62 |  |  | $ | 8.13 |
Net earnings per share - diluted |  | $ | 7.72 |  |  | $ | 8.56 |  |  | $ | 8.04 |
There were certain share-based awards excluded from the calculation of net earnings per share - diluted for the year ended December 31, 2019 and 2018, because their impact was anti-dilutive. No share-based awards were excluded from the calculation for the year ended December 31, 2017. The number, exercise prices and weighted-average remaining life of these antidilutive awards were as follows:
|  | 2019 |  |  | 2018 |  |  | 2017 |
Shares (in thousands) |  |  | 401 |  |  |  | 264 |  |  |  | — |
Exercise price |  | $ | 99 |  |  | $ | 109 |  |  | $ | — |
Weighted-average remaining life |  | 0.9 years |  |  | 1.2 years |  |  |  | — |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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