RESTRUCTURING CHARGES - Restructuring Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total Restructuring Charges
Restructuring Reserve [Roll Forward]
Liability Balance at period start	$ 2.7	$ 13.8
Expense, Net	6.5	26.1
Cash Utilized, Net	(8.8)	(37.2)
Liability Balance at period end	0.4	2.7
RGGA:
Restructuring Reserve [Roll Forward]
Expense, Net	10.2
RGGA: | Total Restructuring Charges
Restructuring Reserve [Roll Forward]
Liability Balance at period start	1.9	12.6
Expense, Net	7.0	26.1
Cash Utilized, Net	(8.8)	(36.8)
Liability Balance at period end	0.1	1.9
RGGA: | Employee severance and other personnel benefits
Restructuring Reserve [Roll Forward]
Liability Balance at period start	1.9	12.6
Expense, Net	0.0	4.1
Cash Utilized, Net	(1.8)	(14.8)
Liability Balance at period end	0.1	1.9
RGGA: | Other
Restructuring Reserve [Roll Forward]
Liability Balance at period start	0.0	0.0
Expense, Net	7.0	22.0
Cash Utilized, Net	(7.0)	(22.0)
Liability Balance at period end	0.0	0.0
Other restructuring initiatives: | Total Restructuring Charges
Restructuring Reserve [Roll Forward]
Liability Balance at period start	0.8	1.2
Expense, Net	(0.5)	0.0
Cash Utilized, Net	0.0	(0.4)
Liability Balance at period end	0.3	0.8
Other restructuring initiatives: | Employee severance and other personnel benefits
Restructuring Reserve [Roll Forward]
Liability Balance at period start	0.8	1.2
Expense, Net	(0.5)	0.0
Cash Utilized, Net	0.0	(0.4)
Liability Balance at period end	$ 0.3	$ 0.8