Subsequent Events (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended						1 Months Ended		0 Months Ended		0 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Revolving Credit Facility [Member]	Jun. 30, 2012 Revolving Credit Facility [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Minimum [Member]	Nov. 02, 2012 Subsequent Event [Member]	Oct. 10, 2012 Subsequent Event [Member]	Oct. 10, 2012 Subsequent Event [Member] Multi-Currency Revolving Credit Facility [Member]	Oct. 10, 2012 Subsequent Event [Member] Letter of Credit [Member]	Oct. 10, 2012 Subsequent Event [Member] Term Loan And Revolving Credit Facility [Member]	Oct. 10, 2012 Subsequent Event [Member] Revolving Credit Facility [Member]	Oct. 10, 2012 Subsequent Event [Member] Term Facility [Member]
Declared cash dividend, per share	$ 0.60	$ 0.30					$ 0.15
Unsecured revolving credit facility, period of agreement, in years									5 years		5 years
Current borrowing capacity									$ 550
Letters of credit										60
Increase in line of credit facility								250
Aggregate revolving commitment									750		300
Required Consolidated EBITDA to consolidated cash interest expense as per New Credit Agreement					3.5:1.0
Required Consolidated total debt to consolidated EBITDA as per New Credit Agreement						3.5:1.0
Required Consolidated total debt to consolidated EBITDA as per New Credit Agreement after acquisition	4.0:1.0
Amount of outstanding letters of credit			8.7	8.7								8.7
Outstanding borrowings under the Term Facility													300
share buyback program	$ 200