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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Disaggregated by Types and Geography (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Total revenue $ 973.7 $ 847.5
U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 691.6 572.4
Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue 282.1 275.1
Instruments and accessories    
Disaggregation of Revenue [Line Items]    
Total revenue 552.3 460.3
Instruments and accessories | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 407.4 337.6
Instruments and accessories | Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue 144.9 122.7
Systems    
Disaggregation of Revenue [Line Items]    
Total revenue 247.5 234.5
Systems | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 160.7 124.0
Systems | Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue 86.8 110.5
Services    
Disaggregation of Revenue [Line Items]    
Total revenue 173.9 152.7
Services | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 123.5 110.8
Services | Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue $ 50.4 $ 41.9