PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Rates Used to Estimate Net Periodic Benefit Costs (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate		5.40%	5.90%	6.30%
United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Discount rate				6.10%
United States Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		3.00%	3.00%	3.00%
United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate		5.00%	5.20%	6.30%
United States Other Postretirement Benefit Plans | Remeasurement for plan changes
Defined Benefit Plan Disclosure [Line Items]
Discount rate				5.60%
United States Other Postretirement Benefit Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		3.00%	3.00%	3.00%
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate		5.30%	6.10%	7.30%
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 rate		5.20%	6.00%	7.30%
Canadian Other Postretirement Benefit Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			3.50%	3.50%
Canadian Other Postretirement Benefit Plans | Remeasurement for plan changes
Defined Benefit Plan Disclosure [Line Items]
Discount rate				5.90%
Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	9.00%	9.50%	9.50%	9.50%
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	3.50%	4.75%	4.75%	4.75%
Pension
Defined Benefit Plan Disclosure [Line Items]
Election of lump sum distributions (U.S. salaried and nonqualified plans only)		65.00%	72.00%	75.00%
Fiscal Year 2009 | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase				0.00%
Fiscal Year 2009 | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase				0.00%
Fiscal Year 2010 | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			1.80%
Fiscal Year 2010 | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			1.80%
Fiscal Year 2011 | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		2.00%
Fiscal Year 2011 | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		2.00%
Fiscal Year 2011 | Canadian Other Postretirement Benefit Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		2.00%
Thereafter | United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		3.50%	3.50%	3.50%
Thereafter | Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		3.50%	3.50%	3.50%
Thereafter | Canadian Other Postretirement Benefit Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase		3.50%