Pensions and Other Employee Benefits, Weighted Average Assumptions Used to Determine Benefit Obligations (Details)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Pension Plans [Member]
Benefit obligations [Abstract]
Discount rate	[1]	4.41%	4.67%
Rate of compensation increase	[2]	3.50%	3.50%
U.S. Based Pension Plans [Member]
Benefit obligations [Abstract]
Rate of compensation increase		3.50%	3.50%
Assumptions used to determine net periodic benefit cost, weighted average discount rate		4.46%	4.73%
Canadian Based Pension Plans [Member]
Benefit obligations [Abstract]
Rate of compensation increase		3.50%	3.50%
Assumptions used to determine net periodic benefit cost, weighted average discount rate		3.80%	3.93%
Postretirement Benefit Plans [Member]
Benefit obligations [Abstract]
Discount rate	[3]	4.05%	4.22%
U.S. Based Postretirement Benefit Plans [Member]
Benefit obligations [Abstract]
Assumptions used to determine net periodic benefit cost, weighted average discount rate		4.11%	4.28%
Canadian Based Postretirement Benefit Plans [Member]
Benefit obligations [Abstract]
Assumptions used to determine net periodic benefit cost, weighted average discount rate		3.64%	3.74%

[1] The weighted average discount rate assumptions used at December 31, 2016 and 2015 were comprised of separate assumptions determined by country of 4.46% and 4.73% for the U.S. based plans, respectively, and 3.80% and 3.93% for the Canadian based plans, respectively.

[2] The weighted average rate of compensation increase assumptions were comprised of separate assumptions determined by country of 3.5% for both the U.S. based plans and Canadian based plans at December 31, 2016 and 2015.

[3] The weighted average discount rate assumptions used at December 31, 2016 and 2015 were comprised of separate assumptions determined by country of 4.11% and 4.28% for the U.S. based plans, respectively, and 3.64% and 3.74% for the Canadian based plans, respectively.