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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 28, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of basic and diluted earnings per share:
| Fiscal Year
(In millions, except per share data) | 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |
Net earnings attributable to Wolverine World Wide, Inc. | $ | 128.5 |  |  | $ | 200.1 |  |  | $ | 0.3 |
Less: net earnings attributed to participating share-based awards | (2.6 | ) |  | (7.5 | ) |  | — |
Net earnings used to calculate basic earnings per share | 125.9 |  |  | 192.6 |  |  | 0.3 |
Adjustment for earnings (loss) reallocated to participating share-based awards | 0.1 |  |  | 1.8 |  |  | (0.2 | )
Net earnings used to calculate diluted earnings per share | $ | 126.0 |  |  | $ | 194.4 |  |  | $ | 0.1 |
Denominator: |  |  |  |  |
Weighted average shares outstanding | 85.7 |  |  | 94.8 |  |  | 96.4 |
Adjustment for unvested restricted common stock | (0.6 | ) |  | (1.8 | ) |  | (2.7 | )
Shares used to calculate basic earnings per share | 85.1 |  |  | 93.0 |  |  | 93.7 |
Effect of dilutive share-based awards | 2.1 |  |  | 2.0 |  |  | 1.7 |
Shares used to calculate diluted earnings per share | 87.2 |  |  | 95.0 |  |  | 95.4 |
Net earnings per share: |  |  |  |  |
Basic | $ | 1.48 |  |  | $ | 2.07 |  |  | $ | — |
Diluted | $ | 1.44 |  |  | $ | 2.05 |  |  | $ | — |

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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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