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ACQUISITIONS - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 18, 2019
Dec. 01, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Goodwill     $ 1,167.7 $ 1,112.2 $ 1,126.5
Total purchase price, net of cash acquired     $ 100.2 $ 0.0 $ 192.9
CAS Medical Systems, Inc.          
Business Acquisition [Line Items]          
Current assets $ 6.1        
Property and equipment, net 1.3        
Goodwill 64.4        
Deferred tax assets 2.2        
Liabilities assumed (17.9)        
Total purchase price 100.8        
Less: cash acquired (0.6)        
Total purchase price, net of cash acquired 100.2        
Harpoon Medical          
Business Acquisition [Line Items]          
Current assets   $ 3.6      
Property and equipment, net   0.3      
Goodwill   142.1      
Other assets   0.1      
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 (Note 4) | CAS Medical Systems, Inc.          
Business Acquisition [Line Items]          
Finite lived intangible assets 35.9        
Customer Relationships | CAS Medical Systems, Inc.          
Business Acquisition [Line Items]          
Finite lived intangible assets $ 8.8        
In-process research and development (Note 4) | Harpoon Medical          
Business Acquisition [Line Items]          
Finite lived intangible assets   $ 53.1