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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Disaggregated by Types and Geography (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Total revenue $ 847.5 $ 679.6
U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 572.4 494.8
Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue 275.1 184.8
Instruments and accessories    
Disaggregation of Revenue [Line Items]    
Total revenue 460.3 380.8
Instruments and accessories | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 337.6 287.6
Instruments and accessories | Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue 122.7 93.2
Systems    
Disaggregation of Revenue [Line Items]    
Total revenue 234.5 160.8
Systems | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 124.0 105.4
Systems | Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue 110.5 55.4
Services    
Disaggregation of Revenue [Line Items]    
Total revenue 152.7 138.0
Services | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 110.8 101.8
Services | Outside of U.S. (“OUS”)    
Disaggregation of Revenue [Line Items]    
Total revenue $ 41.9 $ 36.2