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Short-Term Borrowings	9 Months Ended
Short-Term Borrowings	Sep. 30, 2017
Debt Disclosure [Abstract]
Short-Term Borrowings	Short-Term Borrowings Commercial Paper. The Company’s commercial paper program generally serves as the primary means of short-term funding. As of September 30, 2017, KCS had $355.9 million commercial paper outstanding, net of $0.1 million discount, at a weighted-average interest rate of 1.661%. As of December 31, 2016, KCS had $181.3 million of commercial paper outstanding, net of $0.1 million discount, at a weighted-average interest rate of 1.290%.