Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Apr. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	$ 0.0	$ (0.3)	$ (12.8)	$ 0.0	$ (12.8)
Document Period End Date				Jun. 30, 2018
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3.8	3.3		$ 7.7	6.6
Interest cost	7.2	7.1		14.7	14.1
Expected return on plan assets	(11.8)	(11.2)		(24.0)	(22.2)
Amortization of prior service cost (credit)	(0.2)	(0.3)		(0.6)	(0.6)
Defined Benefit Plan, Amortization of Gain (Loss)	2.3	2.3		4.7	4.6
Curtailment loss	0.1	0.3		0.2	12.8
Net periodic benefit cost	1.4	1.5		2.7	15.3
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0.2		0.3	0.3
Interest cost	0.4	0.3		0.8	0.7
Expected return on plan assets	0.0	0.0		0.0	0.0
Amortization of prior service cost (credit)	(0.4)	(0.4)		(0.7)	(0.7)
Defined Benefit Plan, Amortization of Gain (Loss)	0.0	0.0		0.0	0.0
Curtailment loss	0.0	0.0		0.0	0.0
Net periodic benefit cost	0.2	0.1		0.4	0.3
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.0	2.1		3.8	4.4
Interest cost	11.0	10.9		21.4	21.6
Expected return on plan assets	(17.5)	(16.1)		(34.3)	(32.2)
Amortization of prior service cost (credit)	0.3	0.2		0.5	0.5
Defined Benefit Plan, Amortization of Gain (Loss)	2.0	2.3		3.9	4.2
Curtailment loss	0.0	0.0		0.0	0.0
Net periodic benefit cost	$ (2.2)	$ (0.6)		$ (4.7)	$ (1.5)