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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2019
Jan. 05, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Deferred payments and contingent consideration related to business combinations     $ 4.1 $ 64.7    
Goodwill     335.0     $ 307.2
Chindex            
Business Acquisition [Line Items]            
Total purchase consideration   $ 66.0        
Cash payments   1.3        
Deferred payments and contingent consideration related to business combinations   64.7        
Estimated total undiscounted contingent consideration   $ 81.0        
Decrease in undiscounted expected contingent liability     (9.0)      
Payment of contingent liability     19.3      
Net additional expense     $ 1.4      
Schölly            
Business Acquisition [Line Items]            
Total purchase consideration $ 101.4          
Cash payments 34.4          
Net tangible assets acquired 10.7          
Intangible assets acquired 31.0          
Goodwill $ 59.7          
Weighted average useful life 6 years 7 months 6 days          
Deferred cash payments $ 67.0       $ 37.5  
Inventory 6.7          
Cash $ 1.4