Postretirement Health Care Plans - Net Periodic Postretirement Health Care Cost (Detail) - Other Postretirement Benefit Plans, Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Postretirement Health Care Plans [Line Items]
Service cost		$ 0.1		$ 0.1
Interest cost	$ 0.6	0.5	$ 1.7	1.6
Expected return on plan assets	(0.3)	(0.2)	(0.7)	(0.7)
Amortization of unrecognized loss				0.2
Net periodic postretirement health care cost	$ 0.3	$ 0.4	$ 1.0	$ 1.2