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ACQUISITIONS - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Jan. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Goodwill   $ 1,112.2 $ 1,126.5   $ 626.1
Harpoon Medical          
Business Acquisition [Line Items]          
Current assets $ 3.6        
Property and equipment, net 0.3        
Goodwill 142.1        
IPR&D 53.1   $ 53.1    
Other assets 0.1        
Current liabilities assumed (0.8)        
Deferred income taxes (12.7)        
Total purchase price 185.7        
Less: cash acquired (3.5)        
Total purchase price, net of cash acquired $ 182.2        
Developed technology | Valtech          
Business Acquisition [Line Items]          
IPR&D       $ 109.2  
IPR&D | Valtech          
Business Acquisition [Line Items]          
IPR&D       $ 87.9