SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Accounts Receivable Allowance for Doubtful Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 3.7	$ 4.0	$ 8.0
Additions Charged to Expenses (Income)			(2.2)
Additions Charged to Expenses (Income)	0.9	0.1
Charge-Offs	(0.7)	(0.4)	(1.8)
Other	0.1	0.0	0.0
Balance at End of Year	$ 4.0	$ 3.7	$ 4.0