RESTRUCTURING COSTS - Restructuring Costs by Type (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
Cumulative through December 31, 2021	238.1		238.1
Severance and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs			8.6
Severance and Employee Benefits | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs					73.4	151.2
Cumulative through December 31, 2021	233.2		233.2
Fixed Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring costs			0.0
Fixed Asset Write-offs | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(0.5)	(1.1)
Cumulative through December 31, 2021	(1.6)		(1.6)
Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs			(0.3)
Other Exit Costs | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs					$ 0.3	$ 6.5
Cumulative through December 31, 2021	$ 6.5		$ 6.5