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Net Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Calculations of Net Earnings Per Share - Basic and Diluted | 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 |
Schedule of Antidilutive Securities | 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 Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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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