RESTRUCTURING CHARGES - Restructuring Reserve (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Total Restructuring Charges
Restructuring Reserve [Roll Forward]
Liability Balance at period start	$ 2.7
Expense, Net	5.0
Cash Utilized, Net	(5.1)
Liability Balance at period end	2.6
RGGA:
Restructuring Reserve [Roll Forward]
Expense, Net	8.1
RGGA: | Total Restructuring Charges
Restructuring Reserve [Roll Forward]
Liability Balance at period start	1.9
Expense, Net	5.0
Cash Utilized, Net	(5.1)
Liability Balance at period end	1.8
RGGA: | Employee severance and other personnel benefits
Restructuring Reserve [Roll Forward]
Liability Balance at period start	1.9
Expense, Net	1.2
Cash Utilized, Net	(1.3)
Liability Balance at period end	1.8
RGGA: | Other
Restructuring Reserve [Roll Forward]
Liability Balance at period start	0.0
Expense, Net	3.8
Cash Utilized, Net	(3.8)
Liability Balance at period end	0.0
Other restructuring initiatives: | Total Restructuring Charges
Restructuring Reserve [Roll Forward]
Liability Balance at period start	0.8
Expense, Net	0.0
Cash Utilized, Net	0.0
Liability Balance at period end	0.8
Other restructuring initiatives: | Employee severance and other personnel benefits
Restructuring Reserve [Roll Forward]
Liability Balance at period start	0.8
Expense, Net	0.0
Cash Utilized, Net	0.0
Liability Balance at period end	$ 0.8