PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization expense	$ 63.4	$ 66.8
Operating lease liability	106.8
Finance lease liability	$ 1.0
Rent expense for facilities and equipment		$ 46.5	$ 41.6
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
Decrease in accrued rent				11.3
Decrease in accrued rent, recorded as noncurrent				10.7
Accrued rent, recorded in accrued expenses and other current liabilities				(0.6)
Lease termination liability				(3.5)
Prepaid rent				$ (0.7)