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Disposition of properties
12 Months Ended
Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Disposition of properties Dispositions of properties
During the fourth quarter of 2018, the Company completed the sale of the Bass Lake railway line for gross proceeds of $37 million (U.S. $27 million). The company recorded a gain on sale of $35 million ($26 million after tax) within "Purchased services and other" from the transaction.