Pension Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income Loss (Detail) - Pension Plan - USD ($) $ in Millions	Dec. 28, 2019	Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Net loss, net of tax of $104.8 million and $158.8 million, respectively	$ (333.8)	$ (301.9)
Prior service cost, net of tax of ($0.1) million and $0.4 million, respectively	(0.6)	(0.2)
Amounts included in accumulated other comprehensive income (loss)	(334.4)	(302.1)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Defined Benefit Plan Disclosure [Line Items]
AOCI, tax	104.8	158.8
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Defined Benefit Plan Disclosure [Line Items]
AOCI, tax	$ (0.1)	$ 0.4

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) including portion attributable to noncontrolling interest.

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Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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