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Postretirement Health Care Plans - Net Periodic Postretirement Health Care Cost (Detail) - Postretirement Health Coverage - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Postretirement Health Care Plans [Line Items]
Interest cost	$ 0.4	$ 0.5	$ 1.4	$ 1.4
Expected return on plan assets	(0.1)	(0.2)	(0.5)	(0.6)
Amortization of unrecognized gain	(0.2)	(0.1)	(0.6)	(0.3)
Net periodic cost	$ 0.1	$ 0.2	$ 0.3	$ 0.5

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- Definition

Postretirement Health Care Plans [Line Items]

+ References

No definition available.

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- Definition

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

+ References

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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