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Retirement Benefit Plans (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Pension and Postretirement Expenses to be Recognized in Next Fiscal Year [Abstract]    
Expected recognition of prior service benefit $ 1.5  
Expected recognition of net acturial loss 3.0  
Pension Benefits [Member]    
Other Comprehensive Income (Loss) [Abstract]    
Net prior service cost (0.1) $ 0.9
Net actuarial loss (gain) 12.9 (4.9)
Impact of exchange rates (0.4) (0.4)
Other comprehensive loss (income) 12.4 (4.4)
Postretirement Benefits [Member]    
Other Comprehensive Income (Loss) [Abstract]    
Net prior service cost 1.3 1.3
Net actuarial loss (gain) 0.8 (1.7)
Impact of exchange rates 0.0 0.0
Other comprehensive loss (income) $ 2.1 $ (0.4)