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Earnings per Share (Tables)
 6 Months Ended
Jun. 26, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings per Share
The weighted-average number of shares outstanding used in the computations of basic and diluted (loss) earnings per share were as follows (in millions):
Three Months EndedSix Months Ended
June 26,
2020		June 28,
2019		June 26,
2020		June 28,
2019
Basic84.5  83.8  84.3  83.7  
Dilutive impact of restricted share units and share options—  —  —  0.6  
Diluted84.5  83.8  84.3  84.3