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GOODWILL AND INTANGIBLE ASSETS - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill impairment			$ 0.0	$ 0.0	$ 1,085.8	$ 0.0			$ 0.0	$ 1,085.8	$ 1,650.9
Indefinite-lived intangible asset impairment		$ 5.3			$ 179.2		$ 266.9	$ 79.8	5.3	179.2	346.7
Amortization of intangible assets									189.6	197.9	189.1
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2020									187.1
2021									185.7
2022									183.3
2023									182.3
2024									$ 181.8
Technologies & Equipment
Goodwill [Line Items]
Goodwill impairment	$ 1,085.8						$ 558.0				1,650.9
Indefinite-lived intangible asset impairment										179.2	$ 346.7
Treatment Centers
Goodwill [Line Items]
Goodwill of reporting unit			$ 292.4							$ 292.4