Financial Instruments (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Pre-tax net gains and losses on certain loans designated as hedges of net investments in foreign subsidiaries	$ (5,300,000)	$ (6,300,000)	$ 19,000,000
Foreign currency forward exchange contracts
Derivative [Line Items]
U.S. Dollar Equivalent	434,095,000	324,463,000
Recognized Gain (Loss)	(923,000)	1,732,000
Foreign currency forward exchange contracts | Sell | British pounds sterling
Derivative [Line Items]
U.S. Dollar Equivalent	0	18,350,000
Recognized Gain (Loss)	0	(20,000)
Foreign currency forward exchange contracts | Sell | Euros
Derivative [Line Items]
U.S. Dollar Equivalent	264,234,000	178,889,000
Recognized Gain (Loss)	(1,082,000)	2,345,000
Foreign currency forward exchange contracts | Sell | Other currencies
Derivative [Line Items]
U.S. Dollar Equivalent	2,811,000	2,957,000
Recognized Gain (Loss)	(15,000)	62,000
Foreign currency forward exchange contracts | Buy | British pounds sterling
Derivative [Line Items]
U.S. Dollar Equivalent	6,141,000	4,364,000
Recognized Gain (Loss)	58,000	(12,000)
Foreign currency forward exchange contracts | Buy | Euros
Derivative [Line Items]
U.S. Dollar Equivalent	116,618,000	105,247,000
Recognized Gain (Loss)	187,000	(878,000)
Foreign currency forward exchange contracts | Buy | Other currencies
Derivative [Line Items]
U.S. Dollar Equivalent	44,291,000	14,656,000
Recognized Gain (Loss)	(71,000)	235,000
Derivatives Designated as Hedging Instruments | Cross currency interest rate swaps | Maturing 2018
Derivative [Line Items]
U.S. Dollar Equivalent	250,000,000
Derivatives Designated as Hedging Instruments | Cross currency interest rate swaps | Maturing 2020
Derivative [Line Items]
U.S. Dollar Equivalent	220,000,000
Derivatives Designated as Hedging Instruments | Cross currency interest rate swaps | Maturing 2013
Derivative [Line Items]
U.S. Dollar Equivalent	$ 4,800,000