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Pension Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income Loss (Detail) - Pension Plan - USD ($) $ in Millions	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Net loss, net of tax of $158.8 million and $146.4 million, respectively	$ (301.9)	$ (266.7)
Prior service credit, net of tax of $0.4 million and $0.9 million, respectively	(0.2)	1.5
Amounts included in accumulated other comprehensive income (loss)	(302.1)	(265.2)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Defined Benefit Plan Disclosure [Line Items]
AOCI, tax	158.8	146.4
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Defined Benefit Plan Disclosure [Line Items]
AOCI, tax	$ 0.4	$ 0.9

X

- Definition

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

+ References

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