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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2021
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 2019, 2020, and 2021.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | ​ | (In millions)
Balance at the beginning of the year | ​ | $ | 103.4 | ​ | $ | 99.7 | ​ | $ | 98.6
Additions charged to expense, net | ​ |  | .3 | ​ |  | .7 | ​ |  | 1.6
Payments, net | ​ |  | (4.0) | ​ |  | (1.9) | ​ |  | (2.5)
Changes in currency exchange rates and other | ​ |  | — | ​ |  | .1 | ​ |  | (.1)
Balance at the end of the year | ​ | $ | 99.7 | ​ | $ | 98.6 | ​ | $ | 97.6
Amounts recognized in our Consolidated Balance Sheet at the end of the year: | ​ |  |  | ​ |  |  | ​ |  |
Current liabilities | ​ | $ | 4.5 | ​ | $ | 3.4 | ​ | $ | 3.5
Noncurrent liabilities | ​ |  | 95.2 | ​ |  | 95.2 | ​ |  | 94.1
Total | ​ | $ | 99.7 | ​ | $ | 98.6 | ​ | $ | 97.6
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 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2020 |  | 2021 |
Europe |  | 46% | ​ | 46% | ​ | 46% | ​
North America |  | 34% | ​ | 36% | ​ | 37% | ​

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