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INCOME TAXES - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Jun. 30, 2019
USD ($)
jurisdiction
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Income Tax Contingency [Line Items]          
Tax Cuts and Jobs Act income tax expense     $ 41.0    
Tax loss carry forwards subject to expiration   $ 1,272.7      
Valuation allowance   67.7 104.6    
Unrecognized tax benefits   336.1 303.6 $ 257.9 $ 228.9
Unrecognized tax benefits that would impact effective tax rate   162.2      
Interest accrued   4.5 0.8 1.4  
Penalties accrued   $ 0.0 0.4 $ 0.1  
Number of tax jurisdictions | jurisdiction   55      
Income tax benefit   $ 11.7 53.3    
Amount of decrease in UTBs   23.1      
Foreign earnings repatriated   4,600.0      
Tax Cuts And Jobs Act Of 2017 income tax expense   41.0      
Income and Other Taxes Payable and Other Non-current Liabilities          
Income Tax Contingency [Line Items]          
Accrued interest and penalties   179.9 135.4    
Other Noncurrent Liabilities          
Income Tax Contingency [Line Items]          
Accrued interest and penalties   $ 17.3 $ 13.1    
Galleria          
Income Tax Contingency [Line Items]          
Valuation allowance $ 111.2