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Other Balance Sheet Captions Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Balance Sheet Captions [Abstract]      
Accounts payable $ 174.6 $ 157.1  
Income and other taxes 27.3 34.4  
Accrued wages and vacation 82.4 79.0  
Short-term operating lease liability 24.6 45.4  
Derailments, personal injury and other claim provisions 39.0 38.5  
Dividends payable 40.2 38.7  
Contract liabilities 29.9 30.5 $ 32.4
Interest payable 26.2 23.1  
Other 25.8 26.6  
Accounts payable and accrued liabilities $ 470.0 $ 473.3  
Short-term operating lease liability us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent