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ACQUISITIONS - CardiAQ Valve Technologies, Inc. (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 26, 2015
Jul. 03, 2015
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Cash purchase price subject to certain adjustments     $ 0.0 $ 100.2 $ 0.0
CardiAQ          
Business Acquisition [Line Items]          
Cash purchase price subject to certain adjustments   $ 350.0      
Purchase price subject to certain adjustments $ 348.0        
Additional payments if certain European regulatory approval is obtained $ 50.0        
Period to obtain certain European regulatory approval 48 months        
Liability for estimated fair value of contingent milestone payment $ 30.3        
Additional research and development expenditures to be incurred prior to product introduction $ 97.7