Employee Benefit Plans Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
U.S. Plans
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	$ 1.0	$ 0.9
Interest Cost	20.5	22.5
Expected Return on Plan Assets	(27.2)	(29.5)
Amortization of Net Actuarial Loss	2.9	1.3
Amortization of Prior Service Credit	0	0
Net Periodic Benefit Cost	(2.8)	(4.8)
U.K. Plans
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0	1.1
Interest Cost	2.0	2.3
Expected Return on Plan Assets	(3.1)	(3.4)
Amortization of Net Actuarial Loss	0.1	0.1
Amortization of Prior Service Credit	0	0
Net Periodic Benefit Cost	(1.0)	0.1
OPEB Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0	0.1
Interest Cost	1.8	2.0
Expected Return on Plan Assets	(0.2)	(0.2)
Amortization of Net Actuarial Loss	0	0
Amortization of Prior Service Credit	0	(0.4)
Net Periodic Benefit Cost	$ 1.6	$ 1.5