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SPECIAL CHARGES - Impairment of Long-lived Assets (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]
Other than temporary impairment			$ 31.2
Developed Technology and In-process Research and Development | Valtech
Indefinite-lived Intangible Assets [Line Items]
Impairment of intangible assets		$ 116.2			$ 116.2	$ 116.2
Rest of World | Developed technology (Note 4) | Valtech
Indefinite-lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 40.6			$ 40.6
Rest of World | Developed Technology and In-process Research and Development | Valtech
Indefinite-lived Intangible Assets [Line Items]
Impairment of intangible assets		$ 116.2

X

- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

No definition available.

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- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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- Definition

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+ References

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