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Pension Plans - Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6.9	$ 6.6	$ 14.4	$ 13.5
Interest cost	10.5	12.3	21.1	24.4
Expected return on plan assets	(23.5)	(23.7)	(47.1)	(47.4)
Amortization of unrecognized loss	9.1	8.8	18.2	17.2
Net periodic cost	$ 3.0	$ 4.0	$ 6.6	$ 7.7

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- Definition

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

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