Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	$ 0.0	$ 0.0	$ 0.0
Interest Cost	5.9	7.2	7.2
Expected Return on Plan Assets	(0.6)	(0.6)	(0.7)
Amortization of Net Actuarial Loss	0.0	0.0	0.0
Amortization of Prior Service Cost (Credit)	(0.4)	(0.2)	(0.3)
Plan Amendment, Other Costs	0.0	0.9	0.0
Net Periodic Benefit Cost	4.9	7.3	6.2
Domestic Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	7.9	7.0	3.8
Interest Cost	84.5	85.2	82.2
Expected Return on Plan Assets	(103.1)	(102.8)	(108.9)
Amortization of Net Actuarial Loss	19.6	16.2	11.6
Amortization of Prior Service Cost (Credit)	(0.3)	(0.3)	0.0
Plan Amendment, Other Costs	0.0	0.0	0.0
Net Periodic Benefit Cost	8.6	5.3	(11.3)
Foreign Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	0.0	0.0	0.0
Interest Cost	6.2	7.0	7.9
Expected Return on Plan Assets	(8.8)	(10.0)	(12.4)
Amortization of Net Actuarial Loss	0.7	0.1	0.3
Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0
Plan Amendment, Other Costs	0.0	0.0	0.0
Net Periodic Benefit Cost	$ (1.9)	$ (2.9)	$ (4.2)