Debt

At September 30, 2015 and December 31, 2014, total debt consisted of the following:



	Interest rate	September 30, 2015		December 31, 2014
Commercial paper	0.54%	$	150,000	$	—
Notes due March 2015	5.0%	—		274,879
Notes due January 2016	4.75%	370,914		370,914
Notes due September 2017	5.75%	385,109		385,109
Notes due March 2018	5.6%	250,000		250,000
Notes due May 2018	4.75%	350,000		350,000
Notes due March 2019	6.25%	300,000		300,000
Notes due November 2022	5.25%	110,000		110,000
Notes due March 2024	4.625%	500,000		500,000
Notes due January 2037	5.25%	115,041		115,041
Notes due March 2043	6.7%	425,000		425,000
Term loans	Variable	—		130,000
Other debt		16,877		16,000
Principal amount		2,972,941		3,226,943
Less: unamortized discount		5,605		6,653
Plus: unamortized interest rate swap proceeds		24,810		31,716
Total debt		2,992,146		3,252,006
Less: current portion long-term debt		371,091		324,879
Less: Commercial paper		150,000		—
Long-term debt		$	2,471,055	$	2,927,127

Through the nine months ended September 30, 2015, we repaid the $275 million, 5.0% notes that matured in March and the $130 million term loans.

In October 2015, we announced that we will redeem the $110 million, 5.25% Notes in November 2015. These notes were scheduled to mature in November 2022.