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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended
Feb. 14, 2014
KCSR [Member]
Revolving Credit Facility [Member]
Feb. 07, 2014
KCSR [Member]
Revolving Credit Facility [Member]
Jan. 30, 2014
KCSR [Member]
Revolving Credit Facility [Member]
2012 Credit Agreement [Member]
Feb. 07, 2014
KCSR [Member]
Loans Payable [Member]
Term Loans [Member]
Jan. 30, 2014
KCSR [Member]
Commercial Paper [Member]
KCSR Credit Agreement Amendment [Member]
Feb. 03, 2014
KCSM [Member]
Senior Notes [Member]
KCSM 8.0% Senior Notes, Due February 1, 2018 [Member]
Dec. 31, 2013
KCSM [Member]
Senior Notes [Member]
Floating Rate Senior Notes, Due October 28, 2016 [Member]
Jan. 30, 2014
KCSM [Member]
Commercial Paper [Member]
KCSM Credit Agreement Amendment [Member]
Debt Instrument [Line Items]                
Amount of established commercial paper program         $ 450.0     $ 200.0
Borrowing capacity under KCSR's Revolving Facility     450.0          
Gross amount of debt redeemed and repaid by the Company       245.3   62.8    
Stated interest rate on Senior Notes           8.00%    
Maturity date on Senior Notes           Feb. 01, 2018 Oct. 28, 2016  
Redemption price of Senior Notes expressed as percent of principal amount           104.00%    
Additional borrowings under KCSR's Revolving Facility   175.0            
Repayment of borrowings under KCSR's Revolving Facility $ 175.0