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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Earnings Per Share | The reconciliation of basic and diluted earnings per share on common stock for the third quarter and September year to date 2018 and 2017 follows (in millions of dollars except per share data):
| Third Quarter |  | September Year to Date
| 2018 |  | 2017 |  | 2018 |  | 2017
Net earnings | $ | 33.1 |  |  | $ | 23.0 |  |  | $ | 46.8 |  |  | $ | 53.9 |
Less: earnings allocated to participating securities | (0.4 | ) |  | (0.3 | ) |  | (0.5 | ) |  | (0.9 | )
Net earnings available to common shareholders | $ | 32.7 |  |  | $ | 22.7 |  |  | $ | 46.3 |  |  | $ | 53.0 |
Average shares outstanding (millions): |  |  |  |  |  |  |
Basic | 38.8 |  |  | 38.3 |  |  | 38.7 |  |  | 38.3 |
Dilutive share awards | 0.1 |  |  | 0.5 |  |  | 0.1 |  |  | 0.5 |
Diluted | 38.9 |  |  | 38.8 |  |  | 38.8 |  |  | 38.8 |
Basic earnings per share | $ | 0.84 |  |  | $ | 0.59 |  |  | $ | 1.20 |  |  | $ | 1.38 |
Diluted earnings per share | $ | 0.84 |  |  | $ | 0.58 |  |  | $ | 1.19 |  |  | $ | 1.37 |

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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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