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Earnings Per Share (Tables)
 12 Months Ended
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

 
$
—