Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension Plan | Domestic Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	$ 2.3	$ 2.0	$ 6.9	$ 5.9
Interest Cost	19.9	21.1	59.8	63.3
Expected Return on Plan Assets	(26.1)	(25.8)	(78.4)	(77.3)
Amortization of Net Actuarial Loss	5.4	4.9	16.3	14.7
Amortization of Prior Service Credit	0.0	(0.1)	0.0	(0.2)
Net Periodic Benefit Cost	1.5	2.1	4.6	6.4
Pension Plan | Foreign Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0	0.0	0.0
Interest Cost	1.5	1.6	4.6	4.6
Expected Return on Plan Assets	(2.3)	(2.1)	(7.0)	(5.9)
Amortization of Net Actuarial Loss	0.2	0.2	0.5	0.5
Amortization of Prior Service Credit	0.0	0.0	0.0	0.0
Net Periodic Benefit Cost	(0.6)	(0.3)	(1.9)	(0.8)
OPEB Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0	0.0	0.0
Interest Cost	1.2	1.4	3.7	4.4
Expected Return on Plan Assets	(0.1)	(0.1)	(0.4)	(0.4)
Amortization of Net Actuarial Loss	0.0	0.0	0.0	0.0
Amortization of Prior Service Credit	(0.1)	(0.1)	(0.2)	(0.3)
Net Periodic Benefit Cost	$ 1.0	$ 1.2	$ 3.1	$ 3.7