Accumulated Other Comprehensive (Loss) Income - Changes by Component (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
AOCI Attributable to Parent
Balance			$ 885.7	$ 873.8
OCI before reclassifications			(13.5)	22.7
Amounts reclassified from AOCI			27.7	(1.7)
Total other comprehensive (loss) income	$ (17.5)	$ 8.8	14.2	21.0
Balance	1,238.9	829.5	1,238.9	829.5
Gains and Losses on Derivative Instruments
AOCI Attributable to Parent
Balance			(1.4)	(0.1)
OCI before reclassifications			(5.7)	0.5
Amounts reclassified from AOCI			1.4	(1.5)
Total other comprehensive (loss) income			(4.3)	(1.0)
Balance	(5.7)	(1.1)	(5.7)	(1.1)
Pension Benefit Plan Items
AOCI Attributable to Parent
Balance			(16.8)	(14.4)
OCI before reclassifications			0.0	0.0
Amounts reclassified from AOCI			16.9	(0.2)
Total other comprehensive (loss) income			16.9	(0.2)
Balance	0.1	(14.6)	0.1	(14.6)
Currency Translation Adjustment Items
AOCI Attributable to Parent
Balance			(76.2)	(103.4)
OCI before reclassifications			(7.8)	22.2
Amounts reclassified from AOCI			9.4	0.0
Total other comprehensive (loss) income			1.6	22.2
Balance	(74.6)	(81.2)	(74.6)	(81.2)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent
Balance			(94.4)	(117.9)
Balance	$ (80.2)	$ (96.9)	$ (80.2)	$ (96.9)