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Share Data - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
May 17, 2016
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Share Data          
Percentage used to calculate the difference in strike price and dividend 70        
Stock Options          
Share Data          
Dividend paid   $ 2.4 $ 2.7 $ 2.5 $ 2.8
Dividend payable   0.6   0.6  
Total dividends       7.9  
Dividend accrued   $ 0.1   $ 0.1