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SHARE-BASED COMPENSATION PLANS - Schedule of Share-based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share-based compensation expense $ 14.9   $ 9.6   $ 20.6 $ 14.0
Share-based compensation expense 14.4 $ 6.2 10.3 $ 6.2    
Additional Paid-in Capital            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 14.4 $ 6.2 10.3 $ 6.2    
Equity plan expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share-based compensation expense 13.7   8.6   18.6 13.0
Equity plan expense | Additional Paid-in Capital            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 14.4   10.3   20.6 16.5
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   1.7   2.0 3.5
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   0.9 0.0
Liability plan (income) expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share-based compensation expense 0.8   0.0   0.7 0.0
Fringe expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share-based compensation expense $ 0.4   $ 1.0   $ 0.4 $ 1.0