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Capital Stock - Narratives (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 28, 2019
Nov. 04, 2019
Dec. 31, 2018
Apr. 30, 2018
Class of Stock        
Shares held in employee trust (shares) 193,941   193,941  
Shares held in employee trust $ 12.4   $ 12.4  
Common shares repurchased (shares) 1,192,419      
Shares repurchased (usd per share) $ 16.77      
Common stock        
Class of Stock        
Share authorized for repurchase (shares)       250,000,000
Shares remaining for repurchase $ 105.0      
Subsequent events | Common stock        
Class of Stock        
Shares remaining for repurchase   $ 175.0