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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2018
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 2018.
| Amount |
| (In millions) |
Balance at the beginning of the year | $ | 117.5 |
Additions charged to expense, net |  | 4.5 |
Payments, net |  | (1.1 | )
Balance at the end of period | $ | 120.9 |
Amounts recognized in our Condensed Consolidated Balance Sheet at the end of the period: |  |  |
Current liabilities | $ | 19.6 |
Noncurrent liabilities |  | 101.3 |
Total | $ | 120.9 |

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