RESTRUCTURING COSTS - Narrative (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 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 and related cost, expected cost	$ 7.0
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	422.4
Expected remaining costs	140.0
Remaining accrual	281.7						$ 328.5
Cash expenditures for restructuring	128.4
Restructuring charges	71.7
Global Integration Activities | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring			$ 1.3	$ 14.0	$ 184.4	$ 82.0
Acquisition Integration Program
Restructuring Cost and Reserve [Line Items]
Remaining accrual	10.0						30.4
Cash expenditures for restructuring	18.2
Restructuring charges	1.9
Acquisition Integration Program | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	56.4
Acquisition Integration Program | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring				3.6	2.6	3.8
Other Restructuring 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	20.5
Other Restructuring 2018 | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring					5.0	8.9
Other Restructuring, Integrate Supply Chain and Selling Activities
Restructuring Cost and Reserve [Line Items]
Remaining accrual	2.7						10.1
Restructuring charges	(1.1)	$ 5.0
Other Restructuring, Integrate Supply Chain and Selling Activities | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring					1.1	1.6
Other Restructuring Programs, Assumed Proctor and Gamble Restructuring
Restructuring Cost and Reserve [Line Items]
Remaining accrual	9.3
Restructuring charges	1.5	$ 0.0
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				$ 1.0	$ 5.5	$ 2.8
Other Restructuring | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	6.6
Remaining accrual	2.7						2.8
Cash expenditures for restructuring	3.0
Restructuring charges	3.3
Other Restructuring | Acquisition Integration Program
Restructuring Cost and Reserve [Line Items]
Remaining accrual	4.8						4.1
Cash expenditures for restructuring	1.6
Restructuring charges	1.9
Other Restructuring | Other Restructuring 2018
Restructuring Cost and Reserve [Line Items]
Remaining accrual	13.9						$ 0.0
Cash expenditures for restructuring	6.5
Restructuring charges	$ 20.5