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Other Balance Sheet Captions (Tables)
12 Months Ended
Dec. 31, 2020
Other Balance Sheet Captions [Abstract]  
Schedule of Other Current Assets Other current assets included the following items at December 31 (in millions):
20202019
Refundable Mexican value added tax$— $60.2 
Prepaid income taxes15.8 0.3 
Advances to affiliates9.2 47.3 
Prepaid expenses23.3 21.0 
Property held for sale3.6 11.3 
Other11.4 14.9 
Other current assets$63.3 $155.0 
Schedule of Accounts Payable and Accrued Liabilities Accounts payable and accrued liabilities included the following items at December 31 (in millions):
20202019
Accounts payable$174.6 $157.1 
Income and other taxes27.3 34.4 
Accrued wages and vacation82.4 79.0 
Short-term operating lease liability24.6 45.4 
Derailments, personal injury and other claim provisions39.0 38.5 
Dividends payable40.2 38.7 
Contract liabilities29.9 30.5 
Interest payable26.2 23.1 
Other25.8 26.6 
Accounts payable and accrued liabilities$470.0 $473.3