Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Plan | Domestic Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	$ 2.7	$ 2.3
Interest Cost	20.8	19.9
Expected Return on Plan Assets	(24.8)	(26.1)
Amortization of Net Actuarial Loss (Gain)	5.1	5.4
Amortization of Prior Service Credit	0.0	0.0
Net Periodic Benefit Cost	3.8	1.5
Pension Plan | Foreign Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0
Interest Cost	1.5	1.5
Expected Return on Plan Assets	(2.2)	(2.4)
Amortization of Net Actuarial Loss (Gain)	0.2	0.2
Amortization of Prior Service Credit	0.0	0.0
Net Periodic Benefit Cost	(0.5)	(0.7)
Other Postretirement Benefits Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0
Interest Cost	1.3	1.2
Expected Return on Plan Assets	(0.1)	(0.1)
Amortization of Net Actuarial Loss (Gain)	(0.6)	0.0
Amortization of Prior Service Credit	(0.1)	(0.1)
Net Periodic Benefit Cost	$ 0.5	$ 1.0