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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Disaggregated by Types and Geography (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Total revenue $ 920.9 $ 807.8 $ 2,677.7 $ 2,246.2
U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 676.5 594.6 1,893.6 1,642.0
Outside of U.S. (“OUS”)        
Disaggregation of Revenue [Line Items]        
Total revenue 244.4 213.2 784.1 604.2
Instruments and accessories        
Disaggregation of Revenue [Line Items]        
Total revenue 486.3 401.2 1,422.7 1,179.8
Instruments and accessories | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 368.1 312.7 1,066.0 909.7
Instruments and accessories | Outside of U.S. (“OUS”)        
Disaggregation of Revenue [Line Items]        
Total revenue 118.2 88.5 356.7 270.1
Systems        
Disaggregation of Revenue [Line Items]        
Total revenue 274.6 262.0 786.5 643.9
Systems | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 193.6 175.6 490.0 422.3
Systems | Outside of U.S. (“OUS”)        
Disaggregation of Revenue [Line Items]        
Total revenue 81.0 86.4 296.5 221.6
Services        
Disaggregation of Revenue [Line Items]        
Total revenue 160.0 144.6 468.5 422.5
Services | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 114.8 106.3 337.6 310.0
Services | Outside of U.S. (“OUS”)        
Disaggregation of Revenue [Line Items]        
Total revenue $ 45.2 $ 38.3 $ 130.9 $ 112.5