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Long-Term Debt Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Feb. 21, 2012
Dec. 31, 2011
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 3,810.9      
Unamortized discount and debt issuance costs 47.6 $ 39.6    
Finance lease obligations 7.5      
Total, gross 3,818.4 3,285.6    
Total 3,770.8 3,246.0    
Less: Debt due within one year, gross 6.4 18.0    
Unamortized discount and debt issuance costs, current 0.0 0.0    
Less: Debt due within one year 6.4 18.0    
Long-term debt, gross 3,812.0 3,267.6    
Unamortized discount and debt issuance costs, noncurrent 47.6 39.6    
Long-term debt 3,764.4 3,228.0    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross 0.0 0.0    
Unamortized discount and debt issuance costs 0.0 0.0    
Long-term debt instrument 0.0 0.0    
Senior Notes [Member] | KCSR [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross 2.7 2.7    
Unamortized discount and debt issuance costs 0.0 0.0    
Long-term debt instrument $ 2.7 2.7    
Senior Notes [Member] | KCSR [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate 3.85%      
Senior Notes [Member] | KCSR [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate 4.95%      
Senior Notes [Member] | KCSM [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 5.6 5.6    
Unamortized discount and debt issuance costs 0.0 0.0    
Long-term debt instrument $ 5.6 5.6    
Debt instrument, stated interest rate 3.00%      
Senior Notes [Member] | KCS [Member] | 3.00% senior notes due 2023 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 439.1 439.1    
Unamortized discount and debt issuance costs 1.7 2.5    
Long-term debt instrument $ 437.4 436.6    
Debt instrument, stated interest rate 3.00%      
Senior Notes [Member] | KCS [Member] | 3.85% senior notes due 2023 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 199.2 199.2    
Unamortized discount and debt issuance costs 0.8 1.1    
Long-term debt instrument $ 198.4 198.1    
Debt instrument, stated interest rate 3.85%      
Senior Notes [Member] | KCS [Member] | 3.125% senior notes due 2026 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 250.0 250.0    
Unamortized discount and debt issuance costs 2.0 2.4    
Long-term debt instrument $ 248.0 247.6    
Debt instrument, stated interest rate 3.125%      
Senior Notes [Member] | KCS [Member] | 2.875% senior notes due 2029 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 425.0 425.0    
Unamortized discount and debt issuance costs 3.8 4.2    
Long-term debt instrument $ 421.2 420.8    
Debt instrument, stated interest rate 2.875%      
Senior Notes [Member] | KCS [Member] | 4.30% senior notes due 2043 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 448.7 448.7    
Unamortized discount and debt issuance costs 8.5 8.8    
Long-term debt instrument $ 440.2 439.9    
Debt instrument, stated interest rate 4.30%      
Senior Notes [Member] | KCS [Member] | 4.95% senior notes due 2045 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 499.2 499.2    
Unamortized discount and debt issuance costs 6.9 7.2    
Long-term debt instrument $ 492.3 492.0    
Debt instrument, stated interest rate 4.95%      
Senior Notes [Member] | KCS [Member] | 4.70% senior notes due 2048 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 500.0 500.0    
Unamortized discount and debt issuance costs 5.8 6.0    
Long-term debt instrument $ 494.2 494.0    
Debt instrument, stated interest rate 4.70%      
Senior Notes [Member] | KCS [Member] | 3.50% senior notes due 2050 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 550.0 0.0    
Unamortized discount and debt issuance costs 10.8 0.0    
Long-term debt instrument $ 539.2 0.0    
Debt instrument, stated interest rate 3.50%      
Senior Notes [Member] | KCS [Member] | 4.20% senior notes due 2069 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 425.0 425.0    
Unamortized discount and debt issuance costs 6.9 7.0    
Long-term debt instrument $ 418.1 418.0    
Debt instrument, stated interest rate 4.20%      
Secured Debt [Member] | RRIF loans due serially through 2037 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 66.2 70.2    
Unamortized discount and debt issuance costs 0.4 0.4    
Long-term debt instrument $ 65.8 69.8    
Secured Debt [Member] | RRIF loans due serially through 2037 [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate 2.96%      
Secured Debt [Member] | RRIF loans due serially through 2037 [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate 4.29%      
Secured Debt [Member] | Financing agreements due serially through 2020 [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross $ 0.0 12.0    
Unamortized discount and debt issuance costs 0.0 0.0    
Long-term debt instrument $ 0.0 12.0    
Debt instrument, stated interest rate 9.311%      
Secured Debt [Member] | KCSR [Member] | RRIF loans due serially through 2037 [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate     2.96%  
Secured Debt [Member] | KCSM [Member] | Financing agreements due serially through 2020 [Member]        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate       9.311%
Finance Lease Obligations [Member]        
Debt Instrument [Line Items]        
Finance lease obligations $ 7.5 8.7    
Other Debt Obligations [Member]        
Debt Instrument [Line Items]        
Long-term debt instrument, gross 0.2 0.2    
Unamortized discount and debt issuance costs 0.0 0.0    
Long-term debt instrument $ 0.2 $ 0.2