REVENUE (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Accounts Receivable, Less Allowance				$ 2,472.5	$ 2,088.9	$ 2,659.1
Contract Assets (Current)				63.8	50.5
Contract Assets (Long-Term)				175.9	178.2
Contract Liabilities (Current)				200.6	242.8
Contract Liabilities (Long-Term)				10.7	10.4
Bad debt expense related to the expected impact from the COVID-19 pandemic	$ 26.0
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36.5
Adjustment upon adoption of ASU 2016-13	77.7	$ 36.5		$ 77.7	36.5
Bad debt expense	56.6
Uncollectible accounts written off, net of recoveries	(18.4)
Ending balance	77.7	$ 36.5
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201802Member
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3.0
Adjustment upon adoption of ASU 2016-13	$ 3.0	$ 3.0			$ 3.0
Ending balance		$ 3.0