PENSION AND POST-RETIREMENT BENEFITS - Narrative (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) plan	Dec. 31, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in projected benefit obligation			$ 36,800,000
Increase in projected benefit obligation due to reduction in discount rates			50,500,000
Net periodic benefit cost			4,000,000.0	$ 7,200,000
Estimated contributions in next fiscal year			29,000,000
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost			3,300,000	6,600,000
Employer contributions			$ 9,100,000	11,400,000
Pension Plans | Hedge Funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Redemption notice period			90 days
Pension Plans | Maximum | Common and Collective Funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Redemption notice period			10 years
Pension Plans | Minimum | Common and Collective Funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Redemption notice period			2 days
Pension Plans | Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of qualified defined benefit plans | plan			2
Employer contributions		$ 1,600,000
Employer contributions, deferral in 2020, CARES Act			$ 11,800,000
Other Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost			700,000	600,000
Employer contributions			$ 700,000	$ 700,000
UNITED STATES | Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected long-term return on plan assets (as a percent)			5.50%	6.00%
International Plans | Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected long-term return on plan assets (as a percent)			3.39%	4.86%
Pension plan liabilities retained by affiliates
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Receivables from affiliates			$ 2,200,000	$ 2,300,000
Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company matching contribution per dollar contributed			$ 0.50
Percent of eligible compensation Company matches			6.00%
Employer matching cash contributions			$ 1,400,000	5,500,000
Employer discretionary profit sharing contributions			$ 0	7,200,000
Employer discretionary profit sharing contributions paid	$ 1,600,000			$ 5,600,000
Employer discretionary profit sharing contributions, percentage of employee gross pay				3.00%
Savings Plan | Non highly compensated participants
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee maximum contribution as a percent of eligible compensation			25.00%
Savings Plan | Highly compensated participants
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee maximum contribution as a percent of eligible compensation			12.00%