PENSION AND POST-RETIREMENT BENEFITS - Weighted Average Risk Target Ranges Per Asset Class (Details) - Pension Plans	Dec. 31, 2020
UNITED STATES | Minimum | Common and preferred stock
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
UNITED STATES | Minimum | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	15.00%
UNITED STATES | Minimum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
UNITED STATES | Minimum | Common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	50.00%
UNITED STATES | Minimum | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
UNITED STATES | Minimum | Cash and other investments
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
UNITED STATES | Maximum | Common and preferred stock
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	10.00%
UNITED STATES | Maximum | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	35.00%
UNITED STATES | Maximum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	20.00%
UNITED STATES | Maximum | Common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	70.00%
UNITED STATES | Maximum | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	15.00%
UNITED STATES | Maximum | Cash and other investments
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	10.00%
International Plans | Common and preferred stock
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
International Plans | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
International Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
International Plans | Common and collective funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	100.00%
International Plans | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%
International Plans | Cash and other investments
Defined Benefit Plan Disclosure [Line Items]
Target Ranges	0.00%