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REVENUE AND CONTRACT ACQUISITION COSTS - Revenue Disaggregated by Types and Geography (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,077.7	$ 1,128.2	$ 3,029.3	$ 3,200.8
Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue	630.5	606.2	1,708.8	1,737.0
Systems
Disaggregation of Revenue [Line Items]
Total revenue	267.8	338.6	812.1	929.9
Services
Disaggregation of Revenue [Line Items]
Total revenue	179.4	183.4	508.4	533.9
U.S.
Disaggregation of Revenue [Line Items]
Total revenue	743.8	796.4	2,060.8	2,273.3
U.S. | Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue	467.3	450.7	1,227.2	1,286.7
U.S. | Systems
Disaggregation of Revenue [Line Items]
Total revenue	157.7	217.2	495.8	610.5
U.S. | Services
Disaggregation of Revenue [Line Items]
Total revenue	118.8	128.5	337.8	376.1
Outside of U.S. (“OUS”)
Disaggregation of Revenue [Line Items]
Total revenue	333.9	331.8	968.5	927.5
Outside of U.S. (“OUS”) | Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue	163.2	155.5	481.6	450.3
Outside of U.S. (“OUS”) | Systems
Disaggregation of Revenue [Line Items]
Total revenue	110.1	121.4	316.3	319.4
Outside of U.S. (“OUS”) | Services
Disaggregation of Revenue [Line Items]
Total revenue	$ 60.6	$ 54.9	$ 170.6	$ 157.8

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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