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ACQUISITIONS - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Apr. 18, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 1,173.2 $ 1,167.7 $ 1,112.2
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      
Developed technology | 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