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SUPPLEMENTAL CASH FLOW INFORMATION - RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]        
Cash and cash equivalents $ 20.0 $ 84.5 $ 14.5  
Restricted cash included in other long term assets 46.6   25.7  
Cash, cash equivalents, and restricted cash $ 66.6 $ 146.1 $ 40.2 $ 58.6