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Accounts Payable (Notes)
 12 Months Ended
Dec. 31, 2018
Accounts Payable [Abstract]  
Accounts Payable Accounts Payable
December 31,20182017
(In millions of Canadian dollars)
Accounts payable-trade25.0 19.7 
Property, plant and equipment accrued liabilities24.4 34.8 
49.4 54.5