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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income tax expense using the statutory rate in effect $ 249.6us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 193.1us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 215.7us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax effect of:      
Difference between U.S. and foreign tax rate (23.0)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (15.4)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (18.4)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Foreign exchange and inflation adjustments (25.6)ksu_IncomeTaxReconciliationForeignExchangeAndInflationAdjustment [1] 4.7ksu_IncomeTaxReconciliationForeignExchangeAndInflationAdjustment [1] 42.3ksu_IncomeTaxReconciliationForeignExchangeAndInflationAdjustment [1]
State and local income tax provision, net 11.7us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 8.9us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 8.4us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in valuation allowances (1.8)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.9)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (11.2)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other, net (2.1)us-gaap_IncomeTaxReconciliationOtherAdjustments 7.9us-gaap_IncomeTaxReconciliationOtherAdjustments 0.2us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense $ 208.8us-gaap_IncomeTaxExpenseBenefit $ 198.3us-gaap_IncomeTaxExpenseBenefit $ 237.0us-gaap_IncomeTaxExpenseBenefit
U.S. federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax rate effect of:      
Difference between U.S. and foreign tax rate (3.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Foreign exchange and inflation adjustments (3.60%)ksu_EffectiveIncomeTaxRateReconciliationForeignExchangeAndInflationAdjustment [1] 0.80%ksu_EffectiveIncomeTaxRateReconciliationForeignExchangeAndInflationAdjustment [1] 6.90%ksu_EffectiveIncomeTaxRateReconciliationForeignExchangeAndInflationAdjustment [1]
State and local income tax provision, net 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Change in valuation allowances (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other, net (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 29.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations
[1] Mexican income taxes are paid in Mexican pesos, and as a result, the effective income tax rate reflects fluctuations in the value of the Mexican peso against the U.S. dollar. Most significantly, any gain or loss from the revaluation of net U.S. dollar-denominated monetary liabilities (primarily debt) into Mexican pesos is included in Mexican taxable income under Mexican tax law. As a result, a strengthening of the Mexican peso against the U.S. dollar for the reporting period will generally increase the Mexican cash tax obligation and the effective income tax rate, and a weakening of the Mexican peso against the U.S. dollar for the reporting period will generally decrease the Mexican cash tax obligation and the effective tax rate. To hedge its exposure to this risk, during 2014 and 2013 the Company entered into foreign currency forward contracts, which are measured at fair value each period and any change in fair value is recognized in foreign exchange gain (loss) within the consolidated statements of income.