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Postretirement Health Care Plans - Net Periodic Postretirement Health Care Cost (Detail) - Postretirement Health Coverage - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Postretirement Health Care Plans [Line Items]
Interest cost	$ 0.5	$ 0.5
Expected return on plan assets	(0.2)	(0.2)
Amortization of unrecognized gain	(0.2)	(0.1)
Net periodic pension cost	$ 0.1	$ 0.2

X

- 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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-Publisher FASB
-Name Accounting Standards Codification
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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 cost recognized for passage of time related to defined benefit plan.

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

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