Accumulated Other Comprehensive (Loss) Income - Reclassifications (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ 291.2	$ 287.3
(Loss) income from continuing operations before income taxes	(20.7)	5.5
Tax expense or (benefit)	(1.0)	0.9
Net (loss) income	(19.7)	362.0
Reclassification Out of Accumulated Other Comprehensive (Loss) Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of discontinued operations	0.0	(9.4)
Net (loss) income	(2.6)	(27.2)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Pension Benefit Plan Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation		(3.6)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Gains and losses on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(2.6)	(0.9)
(Loss) income from continuing operations before income taxes	(2.6)	(0.9)
Tax expense or (benefit)	0.0	0.0
Net (loss) income	(2.6)	(0.9)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Recognized net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of discontinued operations	0.0	(16.9)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Prior service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	0.0	0.0
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Amortization of pension benefit plan items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) income from continuing operations before income taxes	0.0	(16.9)
Tax expense or (benefit)	0.0	0.0
Net (loss) income	$ 0.0	$ (16.9)