SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Jul. 01, 2018	Dec. 22, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 19, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash			$ 36.1		$ 36.1			$ 30.6
Effective income tax rate, percentage			0.00%	(7.90%)	(0.10%)	(211.80%)
Effective income tax rate reconciliation, resolution of foreign uncertain tax positions, amount					$ 43.0
Tax Cuts and Jobs Act, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense (benefit)		$ 41.0
Gross unrecognized tax benefits			$ 303.4		303.4			303.6
Unrecognized tax benefits that would impact effective tax rate			118.7		118.7
Unrecognized tax benefits, net			134.9		134.9			135.4
Interest and penalties expense			0.6	$ (0.2)	3.2	$ 1.9
Gross accrued interest and penalties			16.1		16.1			13.1
Reasonably possible decrease in UTBs (up to)			23.2		23.2
Receivables Purchase Agreement, facility limit							$ 150.0
Receivables Purchase Agreement, maximum recourse obligation retained							10.00%
Receivables Purchase Agreement, trade receivables factored during period			109.1		109.1
Receivables Purchase Agreement, trade receivables factored during period, gross			134.6		134.6
Provision for income taxes			0.0	$ 4.4	0.9	(28.8)
Decrease in other current assets					(7.5)	$ (76.2)
Cumulative-effect adjustment increase in accumulated deficit	$ 644.4		$ 1,741.8		$ 1,741.8			$ 626.2
Accounting Standards Update 2016-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gross unrecognized tax benefits	15.8
Provision for income taxes	7.6
Decrease in other current assets	120.8
Cumulative-effect adjustment increase in accumulated deficit	$ 112.6