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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2022
Commitments And Contingencies Disclosure [Abstract] |
Change in Accrued Environmental Remediation and Related Costs | The table below presents a summary of the activity in our accrued environmental costs during 2020, 2021, and 2022.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2020 |  | 2021 |  | 2022
​ | ​ | (In millions)
Balance at the beginning of the year | ​ | $ | 99.7 | ​ | $ | 98.6 | ​ | $ | 97.6
Additions charged to expense, net | ​ |  | .7 | ​ |  | 1.6 | ​ |  | 1.7
Payments, net | ​ |  | (1.9) | ​ |  | (2.5) | ​ |  | (2.0)
Changes in currency exchange rates and other | ​ |  | .1 | ​ |  | (.1) | ​ |  | —
Balance at the end of the year | ​ | $ | 98.6 | ​ | $ | 97.6 | ​ | $ | 97.3
Amounts recognized in the Consolidated Balance Sheet at the end of the year: | ​ |  |  | ​ |  |  | ​ |  |
Current liabilities | ​ | $ | 3.4 | ​ | $ | 3.5 | ​ | $ | 3.8
Noncurrent liabilities | ​ |  | 95.2 | ​ |  | 94.1 | ​ |  | 93.5
Total | ​ | $ | 98.6 | ​ | $ | 97.6 | ​ | $ | 97.3
​
Approximate Percentage of TiO2 Sales by Volume for Segments | Our Chemicals Segment did not have sales to a single customer comprising 10% or more of its net sales in 2021. The table below shows the approximate percentage of our Chemicals Segment’s TiO ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2021 |  | 2022 |
Europe |  | 46% | ​ | 46% | ​ | 45% | ​
North America |  | 36% | ​ | 37% | ​ | 39% | ​
​

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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI https://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q2) -URI https://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(3) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 + Details
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