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Long-Term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 03, 2018
May 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
May 02, 2018
Debt Instrument [Line Items]              
Debt retirement benefits (costs)     $ (2.2) $ 0.0 $ (2.2) $ 0.0  
Financing Agreement [Member] | Debt Retirement Costs [Member]              
Debt Instrument [Line Items]              
Debt retirement benefits (costs)   $ (2.4)          
Export Development Canada Financing Agreement [Member]              
Debt Instrument [Line Items]              
Debt instrument, extinguishment amount   23.0          
DVB Bank AG Financing Agreement [Member]              
Debt Instrument [Line Items]              
Debt instrument, extinguishment amount   $ 19.1          
KCSM [Member] | Senior Notes [Member] | 3.0% Senior Notes Due May 15, 2023 [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date May 15, 2023            
Debt instrument, stated interest rate 3.00%            
Debt instrument, extinguishment amount $ 5.3            
Outstanding principal amount of the senior notes             $ 10.9
Redemption price expressed as a percent of principal amount 95.91%            
KCSM [Member] | Senior Notes [Member] | 3.0% Senior Notes Due May 15, 2023 [Member] | Debt Retirement Costs [Member]              
Debt Instrument [Line Items]              
Debt retirement benefits (costs) $ 0.2            
KCS [Member]              
Debt Instrument [Line Items]              
Debt retirement benefits (costs)     0.0 $ 0.0 0.0 $ 0.0  
KCS [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Outstanding principal amount of the senior notes     $ 2,593.5   $ 2,593.5    
KCS [Member] | Senior Notes [Member] | 4.700% Senior Notes Due May 1, 2048 [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount $ 500.0            
Debt instrument, maturity date May 01, 2048            
Debt instrument, stated interest rate 4.70%            
Debt instrument, unamortized discount $ 0.6            
Debt instrument, yield to maturity 4.707%            
Redemption option senior notes, price expressed as a percent of principal amount 100.00%