Financing Arrangements- Additional Information (Detail)	12 Months Ended			12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 Unsecured Senior Notes USD ($)	Dec. 31, 2011 Five Year Revolving Credit Facility USD ($)	Feb. 28, 2010 Private Placement Notes USD ($)	Dec. 31, 2011 Term Loan Agreement Japanese Yen Denominated Borrowing Expiring March 2014 JPY (¥)	Dec. 31, 2011 Term Loan Agreement Swiss Francs Denominated Borrowing Expiring September 2016 USD ($)	Dec. 31, 2011 Tranche A Unsecured Senior Notes USD ($)	Dec. 31, 2011 Tranche B Unsecured Senior Notes USD ($)	Dec. 31, 2011 Tranche C Unsecured Senior Notes USD ($)	Dec. 31, 2011 Line of Credit Facility, Lender A USD ($)	Dec. 31, 2011 Commercial Paper [Member] USD ($)	Dec. 31, 2010 Commercial Paper [Member] USD ($)	Dec. 31, 2011 Other Short Term Debt [Member] USD ($)	Dec. 31, 2010 Other Short Term Debt [Member] USD ($)	Dec. 31, 2011 Revolving Credit Facilities USD ($)	Dec. 31, 2011 Short-term Debt USD ($)	Dec. 31, 2010 Short-term Debt USD ($)
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity				$ 500,000,000							$ 250,000,000	$ 500,000,000
Facility, utilization, dealer and annual appraisal fees annually average cost												0.15%
Number of revolving credit facilities	2
Short-term debt												266,800,000	119,500,000	8,500,000	5,300,000	750,000,000
Short-term debt, average outstanding amount	225,498,000	11,197,000											218,200,000
Short Term Debt Maturities Repayment Term											364 days
Maturity term of the facility				P5Y		P3Y	P5Y	P2Y	P5Y	P10Y
Short term debt, weighted average interest rates	0.80%	2.30%											0.40%	9.90%	2.30%
Number of participating banks for revolving credit agreement	16
Total unused lines of credit	548,200,000																65,100,000	72,100,000
Available amount under new note					250,000,000
Debt, average maturity years					5 years
Debt, final maturity years					P6Y
Debt, fixed rate					4.10%				2.75%	4.125%
Number of Investors						5
Spread added to variable interest rates of 3 month LIBOR						0.90%	1.125%	1.50%
Debt instrument, description of variable rate basis						LIBOR	LIBOR	LIBOR
Maturity date						Sep. 30, 2014	Sep. 30, 2016
Interest rate terms								"Two-year floating rate notes at a variable rate of three-month USD LIBOR plus 1.5%"	"Five-year fixed rate notes with a semi-annual coupon of 2.75%"
Floating rate senior term loan	1,491,419,000	606,493,000				12,500,000,000	65,000,000
Revolving credit agreement expiry date	July 2016
Debt Instrument Utilization Fee Description	"The Company pays a facility fee of 0.15% per annum on the amount of the commitment under both revolving credit facilities."
Annual Credit facility, commitment fee	0.15%
Debt instrument issued			1,000,000,000		250,000,000			250,000,000	300,000,000	450,000,000
Underwriting fees and discounts	7,600,000
Net proceeds from issuance of debt	$ 992,400,000