RESTRUCTURING COSTS - Restructuring Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 44.2	$ 173.2	$ 374.8
Reclassification of curtailment gain	5.4	10.3	2.2
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	28.5	106.5	365.0
Restructuring costs incurred	500.0
2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	16.8	68.4	0.0
Restructuring costs incurred	85.2
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(1.1)	(1.7)	9.8
Severance and Employee Benefits | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(6.0)	67.5	333.9
Restructuring costs incurred	395.4
Severance and Employee Benefits | 2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	15.4	63.5
Restructuring costs incurred	78.9
Third-Party Contract Terminations | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	4.5	19.3	22.4
Restructuring costs incurred	46.2
Third-Party Contract Terminations | 2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(0.1)	0.2
Restructuring costs incurred	0.1
Fixed Asset Write-offs | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	27.8	14.3	4.6
Restructuring costs incurred	46.7
Fixed Asset Write-offs | 2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	1.3
Restructuring costs incurred	1.3
Other Restructuring | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2.2	5.4	4.1
Restructuring costs incurred	11.7
Other Restructuring | 2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1.5	$ 3.4
Restructuring costs incurred	$ 4.9
Pension Plans | Other income (expense), net | Accounting Standards Update 2017-07 | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Reclassification of curtailment gain			0.8
Pension Plans | Restructuring Charges | Accounting Standards Update 2017-07 | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Reclassification of curtailment gain			$ (0.8)