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Commercial Paper (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Commercial Paper [Line Items]
Amount of commercial paper outstanding	$ 312.0	$ 0
Commercial Paper [Member] \| KCSR [Member]
Commercial Paper [Line Items]
Amount of commercial paper outstanding	312.0
Weighted-average interest rate of commercial paper	0.605%
Commercial Paper [Member] \| KCSM [Member]
Commercial Paper [Line Items]
Amount of commercial paper outstanding	$ 0

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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