MANDATORILY REDEEMABLE FINANCIAL INTERESTS AND REDEEMABLE NONCONTROLLING INTERESTS - Mandatorily Redeemable Financial Interest (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jun. 30, 2018	May 23, 2017
Southeastern Asian Subsidiary
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners (percent)			49.00%
United Arab Emirates Joint Venture
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners (percent)	25.00%
Southeastern Asian Subsidiary
Noncontrolling Interest [Line Items]
Mandatorily redeemable financial instrument, noncontrolling interest	$ 49.6	$ 45.1
Purchase of additional noncontrolling interest			$ 45.0
United Arab Emirates Joint Venture
Noncontrolling Interest [Line Items]
Mandatorily redeemable financial instrument, noncontrolling interest	7.5	8.2
United Arab Emirates Joint Venture | Other Noncurrent Liabilities
Noncontrolling Interest [Line Items]
Mandatorily redeemable financial instrument, noncontrolling interest	6.3	6.7
United Arab Emirates Joint Venture | Accrued Expenses and Other Current Liabilities
Noncontrolling Interest [Line Items]
Mandatorily redeemable financial instrument, noncontrolling interest	$ 1.2	$ 1.5