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
	Apr. 01, 2018	Apr. 02, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax amount	$ 2.4	$ 1.7
Tax	(0.5)	(0.5)
Net of tax	$ 1.9	$ 1.2