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REVENUE AND CONTRACT ACQUISITION COSTS - Revenue Disaggregated by Types and Geography (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 852.1	$ 1,098.9	$ 1,951.6	$ 2,072.6
Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue	460.8	578.5	1,078.3	1,130.8
Systems
Disaggregation of Revenue [Line Items]
Total revenue	261.0	343.8	544.3	591.3
Services
Disaggregation of Revenue [Line Items]
Total revenue	130.3	176.6	329.0	350.5
U.S.
Disaggregation of Revenue [Line Items]
Total revenue	535.5	785.3	1,317.1	1,476.9
U.S. | Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue	315.6	428.6	760.0	836.0
U.S. | Systems
Disaggregation of Revenue [Line Items]
Total revenue	139.3	232.6	338.1	393.3
U.S. | Services
Disaggregation of Revenue [Line Items]
Total revenue	80.6	124.1	219.0	247.6
Outside of U.S. (“OUS”)
Disaggregation of Revenue [Line Items]
Total revenue	316.6	313.6	634.5	595.7
Outside of U.S. (“OUS”) | Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue	145.2	149.9	318.3	294.8
Outside of U.S. (“OUS”) | Systems
Disaggregation of Revenue [Line Items]
Total revenue	121.7	111.2	206.2	198.0
Outside of U.S. (“OUS”) | Services
Disaggregation of Revenue [Line Items]
Total revenue	$ 49.7	$ 52.5	$ 110.0	$ 102.9

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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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