SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs, net	$ 76.0	$ 64.6
Accounting Standards Update 2015-03 | Other Noncurrent Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs, net		(64.6)
Accounting Standards Update 2015-03 | Long-term Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs, net		$ 64.6