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Pension Plans - Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7.5	$ 6.9
Interest cost	10.6	12.1
Expected return on plan assets	(23.6)	(23.7)
Amortization of unrecognized loss	9.1	8.4
Net periodic cost	$ 3.6	$ 3.7

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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