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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]        
Sales-type lease revenue $ 39.0 $ 24.7 $ 140.3 $ 96.5
Operating lease revenue $ 72.5 $ 45.7 $ 198.8 $ 127.0