RESTRUCTURING COSTS - Restructuring Costs by Program (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (4.1)	$ 59.6	$ 8.3	$ 89.7
Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(4.1)	62.5	8.3	93.7	$ 73.2	$ 156.6
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.0	$ (2.9)	$ 0.0	$ (4.0)