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Debt Debt
6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]  
Debt Disclosure [Text Block]
Debt

During the second quarter of 2016, NS issued $600 million of 2.9% senior notes due 2026. In May 2016, we renewed our five-year credit agreement, extending the facility until May 2021. In June 2016, we renewed and amended our accounts receivable securitization facility, extending it until June 2018.