Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-term Debt, Unclassified [Abstract]

Debt With Contractual Term Less Than One Year

	2012		2011
Unsecured commercial paper	$	294,943	$	838,486

Debt With A Contractual Term Greater Than One Year

	2012			2011
Unsecured commercial paper	$	—		$	35,800
Bank borrowings
Credit facilities	—			159,794
Secured debt
Asset-backed Canadian commercial paper conduit facility	175,658			—
Term asset-backed securitization debt	1,447,776			2,087,346
Unsecured notes
5.25% Medium-term notes due in 2012 ($400.0 million par value)	—			399,916
5.75% Medium-term notes due in 2014 ($500.0 million par value)	499,705			499,544
1.15% Medium-term notes due in 2015 ($600.0 million par value)	599,269			—
3.88% Medium-term notes due in 2016 ($450.0 million par value)	449,829			449,775
2.70% Medium-term notes due in 2017 ($400.0 million par value)	399,929			—
6.80% Medium-term notes due in 2018 ($933.5 million par value)	932,540			948,958
15.00% senior unsecured notes due in 2014 ($600.0 million par value)	303,000			303,000
Gross long-term debt	4,807,706			4,884,133
Less: current portion of long-term debt	(437,162		)	(1,040,247		)
Long-term debt	$	4,370,544		$	3,843,886