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SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Employee termination benefits obligations	$ 17.7		$ 17.7		$ 48.4
Charges for employee termination benefits	4.7	$ 8.1	43.0	$ 49.8
Share-based compensation expense associated with equity awards held by terminated employees		$ 1.9	1.2	$ 6.1
Cumulative charges for employee termination benefits	183.4		183.4
Cumulative charges for employee termination benefits related to share-based compensation expense	$ 25.2		$ 25.2

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- Definition

Cumulative Charges for Employee Termination Benefits

+ References

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- Definition

Cumulative Charges for Employee Termination Benefits, Share-Based Compensation

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- Definition

Employee Termination Benefits Obligation

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- Definition

Amount of expense for employee benefit and equity-based compensation.

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- Definition

Amount of noncash expense (reversal of expense) for employee benefits and share-based payment arrangement. Includes, but is not limited to, pension, other postretirement, postemployment and termination benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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