Pension and Other Postretirement Benefits, Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Plans [Member]
Benefit obligations [Abstract]
Discount rate	4.43%	3.78%
Rate of compensation increase	3.50%	3.50%
Pension Plans [Member] | U.S. [Member]
Benefit obligations [Abstract]
Rate of compensation increase	3.50%	3.50%
Assumptions used to determine net periodic benefit cost, weighted average discount rate	4.48%	3.81%
Pension Plans [Member] | Canada [Member]
Benefit obligations [Abstract]
Rate of compensation increase	3.50%	3.50%
Assumptions used to determine net periodic benefit cost, weighted average discount rate	3.88%	3.39%
Postretirement Benefit Plans [Member]
Benefit obligations [Abstract]
Discount rate	4.28%	3.59%
Postretirement Benefit Plans [Member] | U.S. [Member]
Benefit obligations [Abstract]
Assumptions used to determine net periodic benefit cost, weighted average discount rate	4.34%	3.63%
Postretirement Benefit Plans [Member] | Canada [Member]
Benefit obligations [Abstract]
Assumptions used to determine net periodic benefit cost, weighted average discount rate	3.81%	3.33%