Comprehensive Income, Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - Pension Costs [Member] - Reclassification out of Accumulated Other Comprehensive Loss [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Amortization of pension items [Abstract]
Pre-tax amount	$ 2.4	$ 1.8	$ 4.9	$ 3.7
Tax	(0.5)	(0.5)	(1.2)	(1.2)
Net of tax	$ 1.9	$ 1.3	$ 3.7	$ 2.5