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Other Balance Sheet Captions Accounts Payable and Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Balance Sheet Captions [Abstract]      
Accounts payable $ 215.0us-gaap_AccountsPayableCurrent $ 200.5us-gaap_AccountsPayableCurrent  
Accrued wages and vacation 75.1us-gaap_EmployeeRelatedLiabilitiesCurrent 72.7us-gaap_EmployeeRelatedLiabilitiesCurrent  
Derailments, personal injury and other claim provisions 42.4ksu_DerailmentsPersonalInjuryAndOtherClaimProvisionsCurrent 47.9ksu_DerailmentsPersonalInjuryAndOtherClaimProvisionsCurrent  
Dividends payable 31.0us-gaap_DividendsPayableCurrent 23.8us-gaap_DividendsPayableCurrent 0us-gaap_DividendsPayableCurrent
Income and other taxes 24.8us-gaap_TaxesPayableCurrent 18.5us-gaap_TaxesPayableCurrent  
Other 35.6us-gaap_OtherAccruedLiabilitiesCurrent 35.2us-gaap_OtherAccruedLiabilitiesCurrent  
Accounts payable and accrued liabilities $ 423.9us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 398.6us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent