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INVESTMENTS - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) investment
Debt and Equity Securities, FV-NI [Line Items]
Number of investments | investment			0
Upward price adjustments	$ 2.6
Investment	73.6		$ 29.4
Kardion, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Investment		$ 35.9
Investment option to acquire		5.7
Maximum additional option to acquire investment		21.8
Maximum secured promissory note		45.0
Secured promissory note	0.0
Equity Securities | Kardion, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Maximum additional required investment		$ 9.9
Other income, net
Debt and Equity Securities, FV-NI [Line Items]
Increase in non-marketable equity securities due to observable price changes	6.4
Decrease in non-marketable equity securities due to observable price changes	$ 2.6

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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