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Postemployment Benefits Weighted Average Assumptions Used for Benefit Obligations (Details)
Dec. 31, 2014
Dec. 31, 2013
Health and Welfare [Member]    
Postemployment and Other Postretirement Benefit Plans [Line Items]    
Discount rate 3.75%ksu_BenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember		 4.50%ksu_BenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember
Postemployment Benefits [Member]    
Postemployment and Other Postretirement Benefit Plans [Line Items]    
Discount rate 8.00%ksu_BenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember		 8.25%ksu_BenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember
Rate of compensation increase 4.50%ksu_BenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember		 4.50%ksu_BenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember