Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
U.S. Plans
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	$ 1.0	$ 0.9	$ 2.9	$ 2.8
Interest Cost	20.5	22.5	61.6	67.4
Expected Return on Plan Assets	(27.3)	(29.5)	(81.7)	(88.4)
Amortization of Net Actuarial Loss	3.0	1.3	8.7	3.9
Amortization of Prior Service Credit	0.0	0.0	0.0	0.0
Net Periodic Benefit Cost	(2.8)	(4.8)	(8.5)	(14.3)
U.K. Plans
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.0	0.0	2.3
Interest Cost	2.0	2.3	5.9	6.9
Expected Return on Plan Assets	(3.1)	(3.4)	(9.3)	(10.3)
Amortization of Net Actuarial Loss	0.0	0.1	0.2	0.3
Amortization of Prior Service Credit	0.0	0.0	0.0	0.0
Net Periodic Benefit Cost	(1.1)	(1.0)	(3.2)	(0.8)
OPEB Plan
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure
Service Cost	0.0	0.1	0.0	0.2
Interest Cost	1.7	2.0	5.3	5.9
Expected Return on Plan Assets	(0.1)	(0.2)	(0.4)	(0.5)
Amortization of Net Actuarial Loss	0.0	0.0	0.0	0.0
Amortization of Prior Service Credit	0.0	(0.4)	(0.1)	(1.2)
Net Periodic Benefit Cost	$ 1.6	$ 1.5	$ 4.8	$ 4.4