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Earnings Per Share (Tables)
12 Months Ended
Dec. 29, 2019
Earnings Per Share [Abstract]  
Common Stock Reconciliation of Basic and Diluted Earnings Per Share
The reconciliation of basic earnings per share on common stock for the year-end 2019, 2018 and 2017 follows (in millions of dollars except per share data).

 201920182017
Net earnings$112.4  $22.9  $71.6  
Less: Earnings allocated to participating securities(1.1) (0.2) (1.1) 
Net earnings available to common shareholders$111.3  $22.7  $70.5  
Average common shares outstanding (millions):
Basic39.1  38.8  38.3  
Dilutive share awards0.1  0.3  0.7  
Diluted39.2  39.1  39.0  
Basic earnings per share$2.85  $0.59  $1.84  
Diluted earnings per share$2.84  $0.58  $1.81