Borrowings (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Schedule of Short-term Debt [Table Text Block]

Borrowings consist of the following:

	March 31, 2013		December 31, 2012
Short-term
Current portion of long-term debt	$	4,198	$	3,266
Commercial paper	698,400		607,500
	$	702,598	$	610,766

Schedule of Long-term Debt Instruments [Table Text Block]

	March 31, 2013			December 31, 2012
Long-term
4.875% 10-year notes due October 15, 2015	$	299,490		$	299,441
5.45% 10-year notes due March 15, 2018	348,350			348,268
4.30% 10-year notes due March 1, 2021	449,793			449,787
6.60% 30-year notes due March 15, 2038	247,793			247,771
5.375% 30-year notes due March 1, 2041	345,551			345,511
6.65% 30-year debentures due June 1, 2028	199,457			199,448
5.375% 30-year debentures due October 15, 2035	296,406			296,367
Other	6,879			6,023
Total long-term debt	2,193,719			2,192,616
Less current installments	(4,198		)	(3,266		)
	$	2,189,521		$	2,189,350

Schedule of Interest expense and interest income [Table Text Block]

Interest expense and interest income for the three months ended March 31, 2013 and 2012 were as follows:

	Three Months Ended March 31,
	2013			2012
Interest expense	$	30,872		$	31,638
Interest income	(628		)	(1,607		)
Interest expense, net	$	30,244		$	30,031