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Pension Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income Loss (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 30, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Net loss, tax	$ 146.4	$ 160.6
Prior service credit, tax	$ 0.9	$ 1.3

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- Definition

Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), net gains (losses), tax

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No definition available.

+ Details

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- Definition

Pension And Other Postretirement Benefit Plans Accumulated Other Comprehensive Income Loss Net Prior Service Cost Credit Tax

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No definition available.

+ Details

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- References

No definition available.

+ Details

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