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REVENUE AND CONTRACT ACQUISITION COSTS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]          
Price allocated to remaining performance obligations $ 1,415.9   $ 1,415.9    
Remaining performance obligations 5 years   5 years    
Revenue recognized $ 91.5 $ 82.0 $ 223.7 $ 197.8  
Timing of performance obligation     Sales-type leases have terms that generally range from 24 to 84 months and are usually collateralized by a security interest in the underlying assets.    
Costs capitalized as contract acquisition costs $ 39.8   $ 39.8   $ 34.2