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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
	Mar. 31, 2018	Apr. 01, 2017
Numerator:
Net earnings attributable to Wolverine World Wide, Inc.	$ 46.7	$ 16.7
Adjustment for earnings allocated to non-vested restricted common stock	(0.9)	(0.4)
Net earnings used in calculating basic and diluted earnings per share	$ 45.8	$ 16.3
Denominator:
Weighted average shares outstanding	95.7	97.0
Adjustment for non-vested restricted common stock	(2.0)	(2.5)
Shares used in calculating basic earnings per share	93.7	94.5
Effect of dilutive stock options	1.9	1.5
Shares used in calculating diluted earnings per share	95.6	96.0
Net earnings per share:
Basic	$ 0.49	$ 0.17
Diluted	$ 0.48	$ 0.17

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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