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Postemployment Benefits Expected Benefit Payments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Health and Welfare [Member]  
Postemployment and Other Postretirement Benefit Plans [Line Items]  
2015 $ 0.5ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearOne
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember
2016 0.5ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearTwo
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember
2017 0.5ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearThree
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember
2018 0.4ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearFour
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember
2019 0.3ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearFive
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember
2020-2024 1.7ksu_BenefitPlanExpectedFutureBenefitPaymentsInFiveFiscalYearsThereafter
/ ksu_BenefitPlansDisclosuresAxis
= ksu_HealthAndWelfareMember
Postemployment Benefits [Member]  
Postemployment and Other Postretirement Benefit Plans [Line Items]  
2015 1.0ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearOne
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember
2016 1.0ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearTwo
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember
2017 1.1ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearThree
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember
2018 1.3ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearFour
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember
2019 1.4ksu_BenefitPlanExpectedFutureBenefitPaymentsInYearFive
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember
2020-2024 $ 8.9ksu_BenefitPlanExpectedFutureBenefitPaymentsInFiveFiscalYearsThereafter
/ ksu_BenefitPlansDisclosuresAxis
= ksu_PostEmploymentBenefitMember