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Condensed Consolidating Financial Information (Narrative) (Details) (KCSR [Member], Senior Notes [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
4.30% Senior Notes, Due May 15, 2043 [Member]
  
Condensed Financial Statements, Captions [Line Items]  
Outstanding principal amount of the Senior Notes $ 450.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ksu_SeniorNotesFourPointThreeZeroPercentDueMay152043Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate on Senior Notes 4.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ksu_SeniorNotesFourPointThreeZeroPercentDueMay152043Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Maturity date on Senior Notes May 15, 2043
3.85% Senior Notes, Due November 15, 2023 [Member]
  
Condensed Financial Statements, Captions [Line Items]  
Outstanding principal amount of the Senior Notes $ 200.0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ksu_SeniorNotesThreePointEightFivePercentDueNovember152023Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate on Senior Notes 3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ksu_SeniorNotesThreePointEightFivePercentDueNovember152023Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Maturity date on Senior Notes Nov. 15, 2023