Effects Of Foreign Currency Movements - Schedule Of Foreign Currency Exchange Rate Effect Before Tax (Detail) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 PLN / US$ [Member] USD ($)	Sep. 30, 2012 RUR / US$ [Member] USD ($)	Sep. 30, 2012 EUR-Polish Zloty [Member] USD ($)	Sep. 30, 2012 EUR-Polish Zloty [Member] EUR (€)
Effects Of Foreign Currency Movements [Line Items]
Value of notional amount	$ 444	$ 264	$ 557	€ 430
Pre-tax movement	$ 4.4	$ 2.6	$ 5.6