INCOME TAXES - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2018 USD ($) jurisdiction	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act income tax expense			$ 41.0
Tax benefit recognized			24.7	$ 259.5	$ 40.4
Reduction of gross unrecognized tax benefits			42.3	1.5	72.7
Valuation allowance			$ 104.6	60.3
Acquired finite-lived intangible assets, useful life			21 years
Tax loss carry forwards subject to expiration			$ 1,134.1
Unrecognized tax benefits			303.6	257.9	228.9	$ 342.6
Unrecognized tax benefits that would impact effective tax rate			124.7
Accrued interest and penalties			135.4	154.6
Interest accrued			0.8	1.4	1.2
Penalties accrued			$ 0.4	0.1	$ 0.1
Number of tax jurisdictions | jurisdiction			55
Income tax expense (benefit)			$ 53.3	12.3
Amount of decrease in UTBs			9.0
Foreign earnings repatriated			4,500.0
Tax Cuts And Jobs Act Of 2017 income tax expense			41.0
Tax Cuts And Jobs Act Of 2017 tax attributes			311.0
Tax Cuts And Jobs Act Of 2017, deferred tax asset			270.0
Other Noncurrent Liabilities
Income Tax Contingency [Line Items]
Accrued interest and penalties			$ 13.1	11.7
Intellectual Property
Income Tax Contingency [Line Items]
Acquired finite-lived intangible assets, useful life			20 years
Intellectual Property | Prepaid Expenses and Other Current Assets
Income Tax Contingency [Line Items]
Prepaid income taxes			$ 7.6	7.6
Intellectual Property | Other Noncurrent Assets
Income Tax Contingency [Line Items]
Prepaid income taxes			$ 120.6	$ 128.2
IRS | Domestic Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance		$ 111.2
IRS | Domestic Tax Authority | Settlement with Taxing Authority
Income Tax Contingency [Line Items]
Tax benefit recognized		194.4
Reduction of gross unrecognized tax benefits		29.7
IRS | Domestic Tax Authority | Settlement with Taxing Authority | Trademarks
Income Tax Contingency [Line Items]
Recognition of additional deferred tax assets		$ 164.7
Galleria
Income Tax Contingency [Line Items]
Valuation allowance	$ 111.2