RESTRUCTURING COSTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 15.5	$ 11.2
Restructuring costs incurred to date	(0.1)
Expected remaining costs	1.5					$ 3.9
Cash expenditures for restructuring	(0.1)	0.4
Restructuring and related cost, expected cost	4.0
Restructuring liabilities assumed	8.2					9.4
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	6.5	9.8				106.5	$ 364.2
Restructuring costs incurred to date	477.2
Expected remaining costs	60.0
Remaining accrual	170.5					223.1
Cash expenditures for restructuring	58.7
Restructuring charges	8.3
Global Integration Activities | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring			$ 3.0	$ 23.0	$ 144.5
2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	9.1					68.4
Restructuring costs incurred to date	77.5
Remaining accrual	42.5					51.5
Cash expenditures for restructuring	17.8
Restructuring charges	9.5
2018 Restructuring | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring			0.9	3.0	38.6
Other Restructuring 2018 | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring			2.4	2.5	3.3
Other Restructuring Programs, Assumed Proctor and Gamble Restructuring
Restructuring Cost and Reserve [Line Items]
Remaining accrual	6.6					7.0
Cash expenditures for restructuring	0.1	$ (0.1)
Restructuring liabilities assumed								$ 21.7
Other Restructuring Programs, Assumed Proctor and Gamble Restructuring | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring			$ 0.6	$ 2.4	$ 3.6
Other Restructuring | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1.4					5.4	$ 3.3
Restructuring costs incurred to date	10.1
Remaining accrual	2.9					3.1
Cash expenditures for restructuring	1.6
Restructuring charges	1.4
Other Restructuring | 2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.7					3.4
Restructuring costs incurred to date	4.1
Remaining accrual	3.1					$ 3.3
Cash expenditures for restructuring	0.8
Restructuring charges	$ 0.7