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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Earnings Per Share [Abstract] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,185,864 | 1,228,157 | 1,184,559 | 131,004
Numerator: |  |  |  |
Net earnings attributable to Wolverine World Wide, Inc. | $ 22.4 | $ 48.7 | $ 33.8 | $ 129.4
Adjustment for earnings allocated to non-vested restricted common stock | (0.6) | (1.0) | (0.8) | (2.6)
Net earnings used in calculating basic earnings per share | 21.8 | 47.7 | 33.0 | 126.8
Adjustment for earnings reallocated from non-vested restricted common stock | 0.0 | 0.0 | 0.0 | 0.1
Net earnings used in calculating basic and diluted earnings per share | $ 21.8 | $ 47.7 | $ 33.0 | $ 126.9
Denominator: |  |  |  |
Weighted average shares outstanding | 81,900,000 | 83,500,000 | 81,700,000 | 87,300,000
Adjustment for non-vested restricted common stock | (900,000) | (500,000) | (700,000) | (700,000)
Shares used in calculating basic earnings per share | 81,000,000.0 | 83,000,000.0 | 81,000,000.0 | 86,600,000
Effect of dilutive stock options | 500,000 | 900,000 | 500,000 | 1,400,000
Shares used in calculating diluted earnings per share | 81,500,000 | 83,900,000 | 81,500,000 | 88,000,000.0
Net earnings per share: |  |  |  |
Basic | $ 0.27 | $ 0.57 | $ 0.41 | $ 1.46
Diluted | $ 0.27 | $ 0.57 | $ 0.41 | $ 1.44

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