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SEGMENT INFORMATION - THIRD PARTY NET SALES, EXCLUDING PRECIOUS METAL CONTENT (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Net sales	$ 962.1	$ 928.4	$ 2,917.7	$ 2,926.6
Technologies & Equipment
Revenue, Major Customer [Line Items]
Net sales	534.5	508.5	1,613.7	1,571.8
Consumables
Revenue, Major Customer [Line Items]
Net sales	427.6	419.9	1,304.0	1,354.8
Operating Segments
Revenue, Major Customer [Line Items]
Net sales	950.6	920.6	2,886.1	2,899.1
Operating Segments | Technologies & Equipment
Revenue, Major Customer [Line Items]
Net sales	534.5	508.5	1,613.7	1,571.8
Operating Segments | Consumables
Revenue, Major Customer [Line Items]
Net sales	416.1	412.1	1,272.4	1,327.3
Segment Reconciling Items
Revenue, Major Customer [Line Items]
Net sales	$ 11.5	$ 7.8	$ 31.6	$ 27.5

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Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 4
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