RESTRUCTURING COSTS - Narrative (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Oct. 01, 2016
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	$ 401.1
Expected remaining costs	130.0
Remaining accrual	306.7						$ 328.5
Cash expenditures for restructuring	75.8
Restructuring charges	43.1
Global Integration Activities | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring			$ 1.2	$ 8.2	$ 135.5	$ 161.8
Acquisition Integration Program
Restructuring Cost and Reserve [Line Items]
Remaining accrual	10.4						30.4
Cash expenditures for restructuring	17.7
Restructuring charges	2.1
Acquisition Integration Program | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	56.6
Acquisition Integration Program | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring				1.6	2.6	6.2
Other Restructuring, Integrate Supply Chain and Selling Activities
Restructuring Cost and Reserve [Line Items]
Remaining accrual	4.7						$ 10.1
Restructuring charges	(0.7)	$ 5.0
Other Restructuring, Integrate Supply Chain and Selling Activities | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring						4.7
Other Restructuring Programs, Assumed Proctor and Gamble Restructuring
Restructuring Cost and Reserve [Line Items]
Remaining accrual	$ 12.0
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				$ 1.2	$ 4.6	$ 6.2