Pension Plans - Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6.0	$ 6.5
Interest cost	14.1	13.2
Expected return on plan assets	(22.4)	(21.7)
Amortization of unrecognized loss	6.2	8.0
Amortization of prior service credit	(0.2)	(0.3)
Net periodic pension cost	$ 3.7	$ 5.7