Components of Other Non-Operating (Expense) Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Component Of Other Expense Income Nonoperating [Line Items]
FX gain/(loss)	$ (4.8)		$ 0.5	$ (6.0)		$ 3.3
Legacy Tax	12.8	[1]		12.8	[1]	6.4	[1]
Joint venture income	2.3		1.4	6.9		5.3
Other	(0.3)		(0.3)	(1.1)		(1.9)
Total non-operating (expense) income, net	$ 10.0		$ 1.6	$ 12.6		$ 13.1

[1] The 2012 amount represents a reversal of a liability of $12.8 million relating to the favorable resolution of a Legacy Tax Matter for the 2005 and 2006 tax years. The 2011 amounts represent a reversal of a liability relating to the lapse of the statute of limitations for a Legacy Tax Matter.