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Background and Description of the Business - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2020 segment facility	Dec. 31, 2020 segment facility
Segment Reporting Information [Line Items]
Number of reportable segments | segment	4	4
Number of facilities	30	30
Operating Segments [Member]
Segment Reporting Information [Line Items]
Number of facilities	3	3
Titanium Technologies [Member]
Segment Reporting Information [Line Items]
Number of facilities	8	8
Thermal & Specialized Solutions [Member]
Segment Reporting Information [Line Items]
Number of facilities	8	8
Advanced Performance Materials [Member]
Segment Reporting Information [Line Items]
Number of facilities	10	10
Chemical Solutions [Member]
Segment Reporting Information [Line Items]
Number of facilities	1	1

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Number of production facilities in which entity operates.

+ References

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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