Revenue - Revenue Disaggregated by Types and Geography (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,277.7	$ 1,128.2	$ 1,098.9	$ 973.7	$ 1,046.5	$ 920.9	$ 909.3	$ 847.5	$ 4,478.5	$ 3,724.2	$ 3,138.2
Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue									2,408.2	1,962.0	1,636.9
Systems
Disaggregation of Revenue [Line Items]
Total revenue									1,346.1	1,127.1	928.4
Services
Disaggregation of Revenue [Line Items]
Total revenue									724.2	635.1	572.9
U.S.
Disaggregation of Revenue [Line Items]
Total revenue									3,129.5	2,633.5	2,285.8
U.S. | Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue									1,790.4	1,485.2	1,263.1
U.S. | Systems
Disaggregation of Revenue [Line Items]
Total revenue									830.7	692.2	603.5
U.S. | Services
Disaggregation of Revenue [Line Items]
Total revenue									508.4	456.1	419.2
Outside of U.S. (“OUS”)
Disaggregation of Revenue [Line Items]
Total revenue									1,349.0	1,090.7	852.4
Outside of U.S. (“OUS”) | Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue									617.8	476.8	373.8
Outside of U.S. (“OUS”) | Systems
Disaggregation of Revenue [Line Items]
Total revenue									515.4	434.9	324.9
Outside of U.S. (“OUS”) | Services
Disaggregation of Revenue [Line Items]
Total revenue									$ 215.8	$ 179.0	$ 153.7