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REVENUE AND CONTRACT ACQUISITION COSTS - Sales-type and Operating Lease Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]        
Sales-type lease revenue $ 16.8 $ 15.3 $ 71.8 $ 19.9
Operating lease revenue $ 42.2 $ 25.1 $ 81.3 $ 45.5