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Summary Of Significant Accounting Policies - Revenue Disaggregated by Types and Geography (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Total revenue $ 1,046.5 $ 920.9 $ 909.3 $ 847.5 $ 892.0 $ 807.8 $ 758.8 $ 679.6 $ 3,724.2 $ 3,138.2 $ 2,706.5
Instruments and accessories                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 1,962.0 1,636.9 1,395.8
Systems                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 1,127.1 928.4 800.0
Services                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 635.1 572.9 510.7
U.S.                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 2,633.5 2,285.8 1,956.4
U.S. | Instruments and accessories                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 1,485.2 1,263.1 1,077.3
U.S. | Systems                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 692.2 603.5 501.3
U.S. | Services                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 456.1 419.2 377.8
Outside of U.S. (“OUS”)                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 1,090.7 852.4 750.1
Outside of U.S. (“OUS”) | Instruments and accessories                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 476.8 373.8 318.5
Outside of U.S. (“OUS”) | Systems                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 434.9 324.9 298.7
Outside of U.S. (“OUS”) | Services                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 $ 179.0 $ 153.7 $ 132.9