Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan | Domestic Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	$ 2.3	$ 2.0
Interest Cost	19.9	21.1
Expected Return on Plan Assets	(26.1)	(25.8)
Amortization of Net Actuarial Loss	5.4	4.9
Amortization of Prior Service Credit	0.0	(0.1)
Net Periodic Benefit Cost	1.5	2.1
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	(2.4)	(2.0)
Amortization of Net Actuarial Loss	0.2	0.2
Amortization of Prior Service Credit	0.0	0.0
Net Periodic Benefit Cost	(0.7)	(0.3)
Other Postretirement Benefits Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0
Interest Cost	1.2	1.5
Expected Return on Plan Assets	(0.1)	(0.2)
Amortization of Net Actuarial Loss	0.0	0.0
Amortization of Prior Service Credit	(0.1)	(0.1)
Net Periodic Benefit Cost	$ 1.0	$ 1.2