RESTRUCTURING COSTS - Restructuring Costs by Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (6.8)	$ 0.0	$ 1.5	$ 89.7
Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(6.8)	$ 4.7	1.5	$ 98.4	$ 73.2	$ 156.6
Cumulative through March 31, 2022	231.3		231.3
Severance and Employee Benefits | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs			1.8		73.4	151.2
Cumulative through March 31, 2022	226.4		226.4
Fixed Asset Write-offs | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs			0.0		(0.5)	(1.1)
Cumulative through March 31, 2022	(1.6)		(1.6)
Other Exit Costs | Transformation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs			(0.3)		$ 0.3	$ 6.5
Cumulative through March 31, 2022	$ 6.5		$ 6.5