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ACQUISITIONS - Valtech Cardio, Ltd. (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 23, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Business Acquisition [Line Items]              
Fair value of shares issued in connection with business combinations (Note 8)   $ 0.0 $ 0.0 $ 0.0 $ 0.0 $ 0.0 $ 266.5
Valtech              
Business Acquisition [Line Items]              
Purchase price subject to certain adjustments $ 340.0            
Potential milestone-driven payments $ 350.0            
Period to make additional pre-specified milestone-driven payments 10 years            
Issuance of shares of common stock (in shares) 2.8            
Fair value of shares issued in connection with business combinations (Note 8) $ 266.5            
Cash paid to acquire business 86.2            
Liability for estimated fair value of contingent milestone payment 162.9            
Additional research and development expenditures to be incurred prior to product introduction 87.3            
Valtech spin off              
Business Acquisition [Line Items]              
Future option to acquire business, amount 200.0            
Future option to acquire business, additional amount subject to regulatory approval $ 50.0            
Future option to acquire business, period to obtain regulatory approval 10 years            
Developed Technology and In-process Research and Development | Valtech              
Business Acquisition [Line Items]              
Impairment of intangible assets     116.2   $ 116.2 $ 116.2  
Rest of World | Developed Technology and In-process Research and Development | Valtech              
Business Acquisition [Line Items]              
Impairment of intangible assets     $ 116.2        
Rest of World | Developed technology (Note 4) | Valtech              
Business Acquisition [Line Items]              
Impairment of intangible assets   $ 40.6   $ 40.6