PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Rates Used to Estimate Our Net Periodic Benefit Costs (Details)	6 Months Ended		12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, net periodic benefit cost	4.40%	4.90%	4.50%	4.10%
United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase, current year				2.50%	2.50%
Rate of compensation increase, thereafter				3.50%	3.50%
United States Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase				3.00%	3.00%
United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, net periodic benefit cost			4.00%	3.60%	4.00%
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, net periodic benefit cost			4.00%	3.90%	4.70%
Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			3.50%
Rate of compensation increase, current year				2.50%	2.50%
Rate of compensation increase, thereafter				3.50%	3.50%
Canadian Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			3.25%	3.25%	3.25%
Canadian Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates, net periodic benefit cost			3.90%	3.80%	4.60%
Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets			9.00%	9.00%	9.00%
Expected return on plan assets, next fiscal year			8.00%
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets			3.50%	3.50%	3.50%
Pension
Defined Benefit Plan Disclosure [Line Items]
Election of lump sum distributions (U.S. salaried and nonqualified plans only)			60.00%	60.00%	60.00%
Minimum | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			2.00%
Minimum | United States Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			2.30%
Maximum | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			13.00%
Maximum | United States Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			13.00%