LEASES - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability	$ 111.6
Finance lease liability	$ 1.6
Discount rate	16.00%
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right of use asset		$ 109.3
Finance lease, right of use asset		1.5
Operating lease liability		123.4
Finance lease liability		1.4
Accrued rent		(11.3)
Accrued rent, recorded in other long-term liabilities		(10.7)
Accrued rent, recorded in accrued expenses and other current liabilities		(0.6)
Lease termination liability		(3.5)
Prepaid rent		$ (0.7)