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Pension Plans - Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6.3	$ 5.6	$ 18.9	$ 16.8
Interest cost	13.2	13.9	39.6	41.8
Expected return on plan assets	(22.6)	(21.2)	(66.5)	(62.2)
Amortization of unrecognized loss	8.2	6.9	24.6	20.8
Amortization of prior service credit	(0.3)	(0.2)	(0.9)	(0.8)
Net periodic pension cost	$ 4.8	$ 5.0	$ 15.7	$ 16.4

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- Definition

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

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