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Earnings per share (Tables) | 3 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | he following table sets forth the computation of basic and diluted earnings per share for the quarters ended December 31, 2018 and 2017:
(in millions, except per share data) |  |  |
| For the Quarter Ended December 31,
| 2018 |  | 2017
Net earnings | $ | 70.8 |  |  | $ | 60.4 |
Basic average shares outstanding | 59.7 |  |  | 60.2 |
Effect of dilutive restricted stock equivalents | 0.4 |  |  | 0.4 |
Effect of dilutive performance shares | 0.7 |  |  | 0.9 |
Effect of stock based deferred compensation plan | 0.2 |  |  | — |
Diluted average shares outstanding | 61.0 |  |  | 61.5 |
Basic earnings per common share | $ | 1.19 |  |  | $ | 1.00 |
Diluted earnings per common share | $ | 1.16 |  |  | $ | 0.98 |

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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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