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Share-Based Compensation, Employee Stock Purchase Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 6 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Jan. 01, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercised, shares issued 33,402us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 42,391us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 44,319us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans              
Employee Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized 4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		            
Maximum employee contribution rate 5.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     5.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		            
Employee stock purchase plan, purchase price 90.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		                  
Expected dividend yield 0.99%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 0.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 0.59%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		              
Expected volatility 19.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 18.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 28.97%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		              
Risk-free interest rate 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 0.13%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 0.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		              
Expected term (years) 6 months 6 months 6 months              
Weighted-average grant date fair value 17.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 14.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 12.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		              
Compensation expense 0.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 0.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 0.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		              
Shares available for future grants 3,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     3,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		            
July 2014 offering ESPP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercised, purchase price       $ 96.48us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2014OfferingMember		            
Exercised, shares issued       17,639us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2014OfferingMember		            
Proceeds received from employees       1.7us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2014OfferingMember		 [1]            
January 2014 offering ESPP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercised, purchase price         $ 96.76us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= ksu_ESPPJanuary2014OfferingMember		          
Exercised, shares issued         17,026us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= ksu_ESPPJanuary2014OfferingMember		          
Proceeds received from employees         1.6us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_AwardTypeAxis
= ksu_ESPPJanuary2014OfferingMember		 [1]          
July 2013 offering ESPP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercised, purchase price           $ 97.58us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2013OfferingMember		        
Exercised, shares issued           16,376us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2013OfferingMember		        
Proceeds received from employees           1.6us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2013OfferingMember		 [1]        
January 2013 offering ESPP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercised, purchase price             $ 77.53us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= ksu_ESPPJanuary2013OfferingMember		      
Exercised, shares issued             19,292us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= ksu_ESPPJanuary2013OfferingMember		      
Proceeds received from employees             1.5us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_AwardTypeAxis
= ksu_ESPPJanuary2013OfferingMember		 [1]      
July 2012 offering ESPP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercised, purchase price               $ 61.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2012OfferingMember		    
Exercised, shares issued               23,099us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2012OfferingMember		    
Proceeds received from employees               1.4us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_AwardTypeAxis
= ksu_ESPPJuly2012OfferingMember		 [1]    
January 2012 offering ESPP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercised, purchase price                 $ 61.84us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= ksu_Esppjanuary2012OfferingMember		  
Exercised, shares issued                 21,559us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= ksu_Esppjanuary2012OfferingMember		  
Proceeds received from employees                 $ 1.3us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_AwardTypeAxis
= ksu_Esppjanuary2012OfferingMember		 [1]  
Subsequent Event [Member] | Employee Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Maximum employee contribution rate                   10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Employee stock purchase plan, purchase price                   85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
[1] Represents amounts received from employees through payroll deductions for share purchases under applicable offering.