Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
U.S. Plans
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	$ 1.7	$ 1.0
Interest Cost	21.3	20.5
Expected Return on Plan Assets	(25.7)	(27.2)
Amortization of Net Actuarial Loss	4.1	2.9
Amortization of Prior Service Credit	(0.1)	0.0
Net Periodic Benefit Cost	1.3	(2.8)
U.K. Plans
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0
Interest Cost	1.9	2.0
Expected Return on Plan Assets	(2.7)	(3.1)
Amortization of Net Actuarial Loss	0.0	0.1
Amortization of Prior Service Credit	0.0	0.0
Net Periodic Benefit Cost	(0.8)	(1.0)
OPEB Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0
Interest Cost	1.8	1.8
Expected Return on Plan Assets	(0.2)	(0.2)
Amortization of Net Actuarial Loss	0.0	0.0
Amortization of Prior Service Credit	0.0	0.0
Net Periodic Benefit Cost	$ 1.6	$ 1.6