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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract] |
Summary of Activities Relating to Company's CARO Liabilities | The following table summarizes activity relating to CARO liabilities (in millions of dollars):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Beginning balance |  | $ | 6.5 |  |  | $ | 6.3 |  |  | $ | 5.9 |
Liabilities settled during the period |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | — |
Accretion expense |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.4 |
Adjustment to accretion expense due to revisions to estimated cash flow and timing of expenditure1 |  |  | (0.2 | ) |  |  | (0.1 | ) |  |  | — |
Ending balance |  | $ | 6.7 |  |  | $ | 6.5 |  |  | $ | 6.3 |
1. | The adjustments to accretion expense had a $0.01 impact on the basic and diluted net income per share for both 2020 and 2019.
Schedule of Changes in Environmental Contingencies | The following table presents the changes in our environmental accrual, which was primarily included in Long-term liabilities (in millions of dollars):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Beginning balance |  | $ | 17.0 |  |  | $ | 16.9 |  |  | $ | 16.6 |
Additional accruals |  |  | 5.2 |  |  |  | 1.8 |  |  |  | 1.7 |
Less: expenditures |  |  | (3.5 | ) |  |  | (1.7 | ) |  |  | (1.4 | )
Ending balance |  | $ | 18.7 |  |  | $ | 17.0 |  |  | $ | 16.9 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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