RETIREMENT BENEFITS - Assumptions Used (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
U.S. Qualified Pension Plan
Plan Assumptions - During the year
Discount rate (as a percent)	4.40%	4.35%
Plan Assumptions - At year end
Discount rate (as a percent)	3.95%	4.40%
U.S. Nonqualified Pension Plan
Plan Assumptions - During the year
Discount rate (as a percent)	4.35%	4.25%
Plan Assumptions - At year end
Discount rate (as a percent)	3.90%	4.35%
U.S. Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate (as a percent)	4.20%	4.10%
Plan Assumptions - At year end
Discount rate (as a percent)	3.75%	4.20%
Non-U.S. Pension Plans | Weighted Average
Plan Assumptions - During the year
Discount rate (as a percent)	5.37%	5.30%
Plan Assumptions - At year end
Discount rate (as a percent)	5.14%	5.37%
Non-U.S. Pension Plans | Minimum
Plan Assumptions - During the year
Discount rate (as a percent)	0.75%	0.75%
Plan Assumptions - At year end
Discount rate (as a percent)	0.35%	0.75%
Non-U.S. Pension Plans | Maximum
Plan Assumptions - During the year
Discount rate (as a percent)	13.20%	13.30%
Plan Assumptions - At year end
Discount rate (as a percent)	12.30%	13.20%
Non-U.S. Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate (as a percent)	8.60%	8.55%
Plan Assumptions - At year end
Discount rate (as a percent)	8.45%	8.60%