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Long-Term Debt Leases and Debt Maturities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Rental expenses under operating leases $ 76.4us-gaap_OperatingLeasesRentExpenseNet $ 106.7us-gaap_OperatingLeasesRentExpenseNet $ 108.8us-gaap_OperatingLeasesRentExpenseNet
Long-Term Debt      
Long-Term Debt, Payments Due in 2015 20.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths    
Long-Term Debt, Payments Due in 2016 270.8us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
Long-Term Debt, Payments Due in 2017 22.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
Long-Term Debt, Payments Due in 2018 35.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
Long-Term Debt, Payments Due in 2019 15.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive    
Long-Term Debt, Payments Due Thereafter 1,480.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive    
Total Long-Term Debt 1,844.0us-gaap_LongTermDebt    
Capital Leases, Minimum Lease Payments      
Capital Leases, Minimum Lease Payments Due in 2015 6.8us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
Capital Leases, Minimum Lease Payments Due in 2016 6.3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
Capital Leases, Minimum Lease Payments Due in 2017 4.0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
Capital Leases, Minimum Lease Payments Due in 2018 3.9us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
Capital Leases, Minimum Lease Payments Due in 2019 2.7us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
Capital Leases, Minimum Lease Payments Due Thereafter 6.7us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Capital Leases, Minimum Lease Payments Total Due 30.4us-gaap_CapitalLeasesFutureMinimumPaymentsDue    
Capital Leases, Minimum Interest Payments      
Capital Leases, Minimum Interest Payments Due in 2015 2.0ksu_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsCurrent    
Capital Leases, Minimum Interest Payments Due in 2016 1.7ksu_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInTwoYears    
Capital Leases, Minimum Interest Payments Due in 2017 1.3ksu_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInThreeYears    
Capital Leases, Minimum Interest Payments Due in 2018 1.1ksu_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInFourYears    
Capital Leases, Minimum Interest Payments Due in 2019 0.8ksu_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInFiveYears    
Capital Leases, Minimum Interest Payments Due Thereafter 1.7ksu_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueThereafter    
Capital Leases, Minimum Interest Payments Total Due 8.6us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments    
Capital Leases, Net Present Value      
Capital Leases, Net Present Value Due in 2015 4.8ksu_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsCurrent    
Capital Leases, Net Present Value Due in 2016 4.6ksu_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInTwoYears    
Capital Leases, Net Present Value Due in 2017 2.7ksu_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInThreeYears    
Capital Leases, Net Present Value Due in 2018 2.8ksu_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInFourYears    
Capital Leases, Net Present Value Due in 2019 1.9ksu_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInFiveYears    
Capital Leases, Net Present Value Due Thereafter 5.0ksu_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueThereafter    
Capital Leases, Net Present Value Total Due 21.8us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments    
Total Debt      
Total Debt Due in 2015 24.8us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths    
Total Debt Due in 2016 275.4us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo    
Total Debt Due in 2017 24.7us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree    
Total Debt Due in 2018 38.0us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour    
Total Debt Due in 2019 17.4us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive    
Total Debt Due Thereafter 1,485.5us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive    
Total 1,865.8us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities 2,188.9us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities  
Operating Leases, Minimum Lease Payments      
Operating Leases, Minimum Lease Payments Due in 2015 74.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Operating Leases, Minimum Lease Payments Due in 2016 67.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Operating Leases, Minimum Lease Payments Due in 2017 57.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Operating Leases, Minimum Lease Payments Due in 2018 37.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Operating Leases, Minimum Lease Payments Due in 2019 30.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Operating Leases, Minimum Lease Payments Due Thereafter 98.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Operating Leases, Minimum Lease Payments Total Due 365.7us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Total Debt and Operating Leases      
Total Debt and Operating Leases, Payments Due in 2015 99.3ksu_LongtermDebtCapitalLeaseObligationsandOperatingLeasesMaturitiesRepaymentsofPrincipalinNextTwelveMonths    
Total Debt and Operating Leases, Payments Due in 2016 343.0ksu_LongtermDebtCapitalLeaseObligationsandOperatingLeasesMaturitiesRepaymentsofPrincipalinYearTwo    
Total Debt and Operating Leases, Payments Due in 2017 82.0ksu_LongtermDebtCapitalLeaseObligationsandOperatingLeasesMaturitiesRepaymentsofPrincipalinYearThree    
Total Debt and Operating Leases, Payments Due in 2018 75.3ksu_LongtermDebtCapitalLeaseObligationsandOperatingLeasesMaturitiesRepaymentsofPrincipalinYearFour    
Total Debt and Operating Leases, Payments Due in 2019 47.9ksu_LongtermDebtCapitalLeaseObligationsandOperatingLeasesMaturitiesRepaymentsofPrincipalinYearFive    
Total Debt and Operating Leases, Payments Due Thereafter 1,584.0ksu_LongtermDebtCapitalLeaseObligationsandOperatingLeasesMaturitiesRepaymentsofPrincipalDueThereafter    
Total Debt and Operating Leases, Payments Due Total $ 2,231.5ksu_LongtermDebtCapitalLeaseObligationsandOperatingLeasesCurrentandNoncurrent