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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share.
(In millions, except per share data)
13 Weeks Ended
September 30, 2017
 
12 Weeks Ended
September 10, 2016
 
39 Weeks Ended
September 30, 2017
 
36 Weeks Ended
September 10, 2016
Numerator:
 
 
 
 
 
 
 
Net earnings attributable to Wolverine World Wide, Inc.
$
23.2

 
$
48.2

 
$
60.6

 
$
89.6

Adjustment for earnings allocated to non-vested restricted common stock
(0.5
)
 
(1.0
)
 
(1.3
)
 
(1.9
)
Net earnings used in calculating basic and diluted earnings per share
$
22.7

 
$
47.2

 
$
59.3

 
$
87.7

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding
96.1

 
99.4

 
96.6

 
99.4

Adjustment for non-vested restricted common stock
(2.1
)
 
(3.8
)
 
(2.2)

 
(3.8)

Shares used in calculating basic earnings per share
94.0

 
95.6

 
94.4

 
95.6

Effect of dilutive stock options
1.8

 
1.3

 
1.6

 
0.7

Shares used in calculating diluted earnings per share
95.8

 
96.9

 
96.0

 
96.3

Net earnings per share:
 
 
 
 
 
 
 
Basic
$
0.24

 
$
0.49

 
$
0.63

 
$
0.92

Diluted
$
0.24

 
$
0.49

 
$
0.62

 
$
0.91