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ACQUISITION - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
9 Months Ended
Apr. 18, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 1,156.6   $ 1,112.2
Total purchase price, net of cash acquired   $ 100.2 $ 0.0  
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      
CAS Medical Systems, Inc. | Developed technology        
Business Acquisition [Line Items]        
Intangible assets 35.9      
CAS Medical Systems, Inc. | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets $ 8.8