Accumulated Other Comprehensive (Loss) Income - Reclassifications (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (302.2)	$ (293.5)	$ (589.5)	$ (561.6)
Income (loss) from continuing operations before income taxes	14.3	(6.1)	19.8	(14.6)
Tax expense or (benefit)	(2.1)	1.6	(3.0)	(0.1)
Net income (loss)	10.8	(22.3)	372.8	(56.7)
Defined benefit Plan, gain (loss), reclassification adjustment from AOCI, tax			3.6
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	0.0	(9.4)	0.0
Net income (loss)	(0.5)	1.1	(27.7)	1.7
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	(0.5)	0.8	(1.4)	1.5
Income (loss) from continuing operations before income taxes	(0.5)	0.8	(1.4)	1.5
Tax expense or (benefit)	0.0	0.0	0.0	0.0
Net income (loss)	(0.5)	0.8	(1.4)	1.5
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	0.0	(16.9)	0.0
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	0.3	0.0	0.2
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Amortization of pension benefit plan items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before income taxes	0.0	0.3	(16.9)	0.2
Tax expense or (benefit)	0.0	0.0	0.0	0.0
Net income (loss)	$ 0.0	$ 0.3	$ (16.9)	$ 0.2