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REVENUE AND CONTRACT ACQUISITION COSTS - Sales-type and Operating Lease Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]        
Operating lease revenue $ 27.4 $ 14.0 $ 72.9 $ 35.0
Sales-type lease revenue $ 14.8 $ 23.0 $ 34.7 $ 48.3