RESTRUCTURING COSTS - Restructuring Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 137.7	$ 44.2	$ 173.2
Expense reclassified to discontinued operations	(7.5)	(10.0)	(38.3)
Restructuring costs	130.2	34.2	134.9
Turnaround Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	165.2	0.0	0.0
Cumulative restructuring costs	165.2
Turnaround Plan | Severance and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs	159.8
Turnaround Plan | Fixed Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(1.1)
Turnaround Plan | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	6.5
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(23.9)	28.5	106.5
Restructuring costs	(23.9)	28.5	106.5	$ 365.0
Cumulative restructuring costs	476.1
Global Integration Activities | Severance and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(18.3)	(6.0)	67.5	333.9
Cumulative restructuring costs	377.1
Global Integration Activities | Third-Party Contract Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(5.5)	4.5	19.3	22.4
Cumulative restructuring costs	40.7
Global Integration Activities | Fixed Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	27.8	14.3	4.6
Cumulative restructuring costs	46.7
Global Integration Activities | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(0.1)	2.2	5.4	$ 4.1
Cumulative restructuring costs	11.6
2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(3.0)	16.8	68.4
Restructuring costs	(3.0)	16.8	68.4
Cumulative restructuring costs	82.2
2018 Restructuring Actions | Severance and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(3.0)	15.4	63.5
Cumulative restructuring costs	75.9
2018 Restructuring Actions | Third-Party Contract Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	(0.1)	0.2
Cumulative restructuring costs	0.1
2018 Restructuring Actions | Fixed Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.0	1.3
Cumulative restructuring costs	1.3
2018 Restructuring Actions | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	1.5	3.4
Cumulative restructuring costs	4.9
Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (0.6)	$ (1.1)	$ (1.7)