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Earnings Per Share (Tables) | 12 Months Ended
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Jan. 02, 2021
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) | 2020 |  | 2019 |  | 2018
Numerator: |  |  |  |  |
Net earnings (loss) attributable to Wolverine World Wide, Inc. | $ | (136.9) |  |  | $ | 128.5 |  |  | $ | 200.1 |
Less: net earnings attributed to participating share-based awards | (0.8) |  |  | (2.6) |  |  | (7.5) |
Net earnings (loss) used to calculate basic earnings per share | (137.7) |  |  | 125.9 |  |  | 192.6 |
Adjustment for earnings reallocated to participating share-based awards | — |  |  | 0.1 |  |  | 1.8 |
Net earnings (loss) used to calculate diluted earnings per share | $ | (137.7) |  |  | $ | 126.0 |  |  | $ | 194.4 |
Denominator: |  |  |  |  |
Weighted average shares outstanding | 81.8 |  |  | 85.7 |  |  | 94.8 |
Adjustment for unvested restricted common stock | (0.8) |  |  | (0.6) |  |  | (1.8) |
Shares used to calculate basic earnings per share | 81.0 |  |  | 85.1 |  |  | 93.0 |
Effect of dilutive share-based awards | — |  |  | 2.1 |  |  | 2.0 |
Shares used to calculate diluted earnings per share | 81.0 |  |  | 87.2 |  |  | 95.0 |
Net earnings (loss) per share: |  |  |  |  |
Basic | $ | (1.70) |  |  | $ | 1.48 |  |  | $ | 2.07 |
Diluted | $ | (1.70) |  |  | $ | 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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