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GOODWILL AND INTANGIBLE ASSETS - NARRATIVE (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2018
USD ($)
segment
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Number of reporting units | segment 11          
Goodwill   $ 3,457.8   $ 3,457.8   $ 4,539.2
Goodwill impairment   1,085.8 $ 1,092.9 1,085.8 $ 1,092.9  
Indefinite-lived intangible asset impairment $ 179.2   $ 79.8 179.2 $ 79.8  
Treatment Centers            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Sensitivity analysis, reduction rate 10.00%          
Goodwill   $ 292.7   $ 292.7    
Discounted Cash Flow | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Goodwill measurement period 5 years          
Goodwill forecasted cash flows, discount rate 7.90%          
Discounted Cash Flow | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Goodwill measurement period 10 years          
Goodwill forecasted cash flows, discount rate 10.50%