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EMPLOYEE SEPARATION AND RESTRUCTURING COSTS - Integration Restructuring (Details) - Clariant Color Acquisition Integration, Restructuring Plan - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Beginning balance	$ 31.1	$ 36.7
Restructuring charges	(2.7)	8.1
Payments, utilization and translation	(2.4)	(13.7)
Ending balance	26.0	31.1
Workforce reductions
Restructuring Reserve [Roll Forward]
Beginning balance	30.3	34.3
Restructuring charges	(2.8)	6.9
Payments, utilization and translation	(2.3)	(10.9)
Ending balance	25.2	30.3
Plant closing and other
Restructuring Reserve [Roll Forward]
Beginning balance	0.8	2.4
Restructuring charges	0.1	1.2
Payments, utilization and translation	(0.1)	(2.8)
Ending balance	$ 0.8	$ 0.8

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Restructuring Reserve, Payments, Utilization, And Foreign Currency Translation

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Topic 420
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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