Pension Plans - Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6.9	$ 6.0
Interest cost	12.1	14.1
Expected return on plan assets	(23.7)	(22.4)
Amortization of unrecognized loss	8.4	6.2
Amortization of prior service credit	0.0	(0.2)
Net periodic cost	$ 3.7	$ 3.7