SHARE-BASED COMPENSATION PLANS - Schedule of Share-based Compensation (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 29.7		$ 14.9			$ 138.0	$ 20.6
Share-based compensation expense	26.9	$ 107.8		$ 6.2	$ 14.4
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	26.9	$ 107.8		$ 6.2	$ 14.4
Equity plan expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	26.9		13.7			134.7	18.6
Equity plan expense | Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	26.9		14.4			134.7	20.6
Equity plan expense | Additional Paid-in Capital | Discontinued Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			0.7				2.0
Equity plan modified and cash settled
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	0.0		0.0			0.0	0.9
Liability plan (income) expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	0.7		0.8			1.1	0.7
Fringe expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 2.1		$ 0.4			$ 2.2	$ 0.4