Pension Plans - Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5.3	$ 4.8	$ 11.2	$ 9.7
Interest cost	13.9	14.4	27.9	28.4
Expected return on plan assets	(20.9)	(20.7)	(41.0)	(40.4)
Amortization of unrecognized loss	7.0	8.5	13.9	15.7
Amortization of prior service credit	(0.3)	(0.3)	(0.6)	(0.6)
Net periodic pension cost	$ 5.0	$ 6.7	$ 11.4	$ 12.8