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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)