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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Contingent Consideration Arrangements    
Contingent consideration, maximum amount at balance sheet date $ 32.1  
Contingent consideration, fair value at balance sheet date with a maximum limit 2.1  
Contingent consideration, at fair value, current 2.0 $ 0.6
Contingent consideration, at fair value, noncurrent   2.0
Assets measured at fair value on a nonrecurring basis    
Cost method investments $ 81.0 $ 63.4
Contingent Consideration Arrangements    
Contingent Consideration Arrangements    
Contingent consideration, discount rates (as a percent) 12.00% 12.00%