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REVENUE AND CONTRACT ACQUISITION COSTS - Revenue Disaggregated by Types and Geography (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total revenue $ 1,292.1 $ 1,099.5
Instruments and accessories    
Disaggregation of Revenue [Line Items]    
Total revenue 705.9 617.5
Systems    
Disaggregation of Revenue [Line Items]    
Total revenue 368.7 283.3
Services    
Disaggregation of Revenue [Line Items]    
Total revenue 217.5 198.7
U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 847.5 781.6
U.S. | Instruments and accessories    
Disaggregation of Revenue [Line Items]    
Total revenue 500.8 444.4
U.S. | Systems    
Disaggregation of Revenue [Line Items]    
Total revenue 202.7 198.8
U.S. | Services    
Disaggregation of Revenue [Line Items]    
Total revenue 144.0 138.4
Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue 444.6 317.9
Outside of U.S. (“OUS”) | Instruments and accessories    
Disaggregation of Revenue [Line Items]    
Total revenue 205.1 173.1
Outside of U.S. (“OUS”) | Systems    
Disaggregation of Revenue [Line Items]    
Total revenue 166.0 84.5
Outside of U.S. (“OUS”) | Services    
Disaggregation of Revenue [Line Items]    
Total revenue $ 73.5 $ 60.3