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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Numerator:        
Net earnings attributable to Wolverine World Wide, Inc. $ 55.3 $ 20.7 $ 102.0 $ 37.4
Adjustment for earnings allocated to non-vested restricted common stock (1.2) (0.5) (2.2) (0.8)
Net earnings used in calculating basic earnings per share 54.1 20.2 99.8 36.6
Adjustment for earnings reallocated from non-vested restricted common stock 0.0 0.0 0.1 0.0
Net earnings used in calculating diluted earnings per share $ 54.1 $ 20.2 $ 99.9 $ 36.6
Denominator:        
Weighted average shares outstanding 94.9 96.8 95.3 96.9
Adjustment for non-vested restricted common stock (1.8) (2.2) (1.9) (2.3)
Shares used in calculating basic earnings per share 93.1 94.6 93.4 94.6
Effect of dilutive stock options 1.9 1.6 1.9 1.5
Shares used in calculating diluted earnings per share 95.0 96.2 95.3 96.1
Net earnings per share:        
Basic $ 0.58 $ 0.21 $ 1.07 $ 0.39
Diluted $ 0.57 $ 0.21 $ 1.05 $ 0.38