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Earnings Per Share (Tables)
 12 Months Ended
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)202020192018
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