MANDATORILY REDEEMABLE FINANCIAL INTERESTS AND REDEEMABLE NONCONTROLLING INTERESTS - Mandatorily Redeemable Financial Interest (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	May 23, 2017
United Arab Emirates Joint Venture
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners (percent)	25.00%
Mandatorily redeemable financial instrument, noncontrolling interest	$ 7.8	$ 8.2
Southeastern Asian Subsidiary
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners (percent)			49.00%
Mandatorily redeemable financial instrument, noncontrolling interest	49.5	45.1
Purchase of additional noncontrolling interest			$ 45.0
Other Noncurrent Liabilities | United Arab Emirates Joint Venture
Noncontrolling Interest [Line Items]
Mandatorily redeemable financial instrument, noncontrolling interest	6.1	6.7
Accrued Expenses and Other Current Liabilities | United Arab Emirates Joint Venture
Noncontrolling Interest [Line Items]
Mandatorily redeemable financial instrument, noncontrolling interest	$ 1.7	$ 1.5