Retirement Plans (Schedule of Amounts to be Amortized From Accumulated Other Comprehensive Income) (Details) $ in Millions	Dec. 29, 2017 USD ($)
Pension Benefits
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Amortization of net actuarial loss	$ (0.5)
Amortization of prior service (cost) credit	(0.1)
Postretirement Benefits
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Amortization of net actuarial loss	(0.1)
Amortization of prior service (cost) credit	$ 2.1