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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 |

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