Debt (Details) (USD $) In Thousands, unless otherwise specified			1 Months Ended															9 Months Ended			0 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Commercial Paper [Member]	Sep. 30, 2014 4.75% Senior Notes due November 2014	Dec. 31, 2013 4.75% Senior Notes due November 2014	Sep. 30, 2014 4.75% Senior Notes due November 2014 Level 1	Dec. 31, 2013 4.75% Senior Notes due November 2014 Level 1	Sep. 30, 2014 1.55% Senior Notes due September 2017	Sep. 30, 2014 1.55% Senior Notes due September 2017 Level 1	Sep. 30, 2014 2.55% Senior Notes due January 2019	Sep. 30, 2014 2.55% Senior Notes due January 2019 Level 1	Sep. 30, 2014 3.125% Senior Notes due September 2021	Sep. 30, 2014 3.125% Senior Notes due September 2021 Level 1	Sep. 30, 2014 4.00% Senior Notes	Dec. 31, 2013 4.00% Senior Notes	Sep. 30, 2014 4.00% Senior Notes Level 1	Dec. 31, 2013 4.00% Senior Notes Level 1	Sep. 30, 2014 Revolving Credit Facility	Sep. 30, 2014 Revolving Credit Facility Level 2	Dec. 31, 2013 Revolving Credit Facility Level 2	May 30, 2014 Credit Agreement	Sep. 30, 2014 Credit Agreement	Dec. 31, 2013 Credit Agreement Level 2	Sep. 30, 2014 Notes payable to foreign banks and other debt	Dec. 31, 2013 Notes payable to foreign banks and other debt
Debt
Total debt, Carrying Amount	$ 2,623,981	$ 2,132,874		$ 599,981	$ 599,813			$ 374,625		$ 749,001		$ 374,673		$ 499,067	$ 498,973				$ 21,800	$ 927,300			$ 100,000	$ 4,834	$ 6,788
Less current portion	(600,803)	(701,437)
Long-term debt, Carrying Amount	2,023,178	1,431,437
Maximum borrowing capacity																		1,500,000				200,000
Increase the borrowing capacity under amended and restated Credit Agreement																					100,000
Current borrowing capacity																					200
Borrowings under the Revolving Credit Facility																		21,800
Availability under the Revolving Credit Facility																		1,478,200
Interest rate on borrowings under the Revolving Credit Facility, variable rate																		LIBOR				LIBOR
Stated interest rate (as a percent)				4.75%				1.55%		2.55%		3.125%		4.00%
Total debt, Approximate Fair Value	2,657,802	2,146,088				602,880	621,000		374,475		754,800		373,763			525,250	491,000		21,800	927,300			100,000	4,834	6,788
Less short-term debt, Approximate Fair Value	(603,702)	(722,624)
Long-term debt, Approximate Fair Value	2,054,100	1,423,464
Debt instrument, principal amount								375				375
Debt instrument, face amount, net of discount (as a percent)								99.898%				99.912%
Maximum amount outstanding during period			1,500,000
Maximum maturity term			397 days
Outstanding borrowings under the Program			$ 0