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Commitments and contingencies (Tables) | 6 Months Ended
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Jun. 30, 2024
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 the first six months of 2024.
​ | ​ | ​ | ​
​ | ​ | Amount
​ |  | (In millions)
​ | ​ | ​ | ​
Balance at the beginning of the period | ​ | $ | 96.9
Additions charged to expense, net | ​ |  | 1.7
Payments, net | ​ |  | (1.6)
Balance at the end of the period | ​ | $ | 97.0
Amounts recognized in the Condensed Consolidated Balance Sheet at the end of the period: | ​ |  |
Current liabilities | ​ | $ | 3.9
Noncurrent liabilities | ​ |  | 93.1
Total | ​ | $ | 97.0

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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 -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 + Details
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