RESTRUCTURING - Changes to the Liability for November 2020 Restructuring Initiative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
2020 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Net (charge reversals) charges	$ 35,952	$ 67,329	$ 67,850	$ 75,714
Total | 2020 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Beginning liability balance			59,002
Net (charge reversals) charges			(3,419)
Cash payments			(32,125)
Ending liability balance	23,458		23,458
Employee Separation, Continuity and Other Benefit-Related Costs | 2020 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Beginning liability balance			58,338
Net (charge reversals) charges			(6,150)
Cash payments			(28,957)
Ending liability balance	23,231		23,231
Certain Other Restructuring Costs
Restructuring Reserve [Roll Forward]
Net (charge reversals) charges	24,800	$ 3,400	37,500	$ 9,800
Certain Other Restructuring Costs | 2020 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Beginning liability balance			664
Net (charge reversals) charges			2,731
Cash payments			(3,168)
Ending liability balance	$ 227		$ 227