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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 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 the first six months of 2022. ​
​ | ​ | ​ | ​
​ | ​ | Amount
​ |  | (In millions)
​ | ​ | ​ | ​
Balance at the beginning of the period | ​ | $ | 97.6
Additions charged to expense, net | ​ |  | 1.4
Payments, net | ​ |  | (.9)
Balance at the end of the period | ​ | $ | 98.1
Amounts recognized in the Consolidated Balance Sheet at the end of the period: | ​ |  |
Current liabilities | ​ | $ | 4.0
Noncurrent liabilities | ​ |  | 94.1
Total | ​ | $ | 98.1

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