PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Receivables from suppliers	$ 36.0	$ 10.7
Prepaid cost of telecommunications services	19.4	11.8
Prepaid selling, general and administrative	12.6	13.1
Deferred commissions	11.3	9.8
Other	2.8	5.0
Prepaid expenses and other current assets	$ 82.1	$ 50.4