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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2022
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, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Beginning balance |  | $ | 7.2 |  |  | $ | 6.7 |  |  | $ | 6.5 |
Liabilities added during the period |  |  | 2.3 |  |  |  | — |  |  |  | — |
Liabilities settled during the period |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.1 | )
Accretion expense |  |  | 0.7 |  |  |  | 0.6 |  |  |  | 0.5 |
Adjustment to accretion expense due to revisions to estimated cash flow and timing of expenditure 1 |  |  | — |  |  |  | — |  |  |  | (0.2 | )
Ending balance |  | $ | 10.1 |  |  | $ | 7.2 |  |  | $ | 6.7 |
1. The adjustments to accretion expense had a $0.01 impact on the basic and diluted net income per share for 2020.
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, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Beginning balance |  | $ | 16.8 |  |  | $ | 18.7 |  |  | $ | 17.0 |
Additional accruals |  |  | 3.2 |  |  |  | 0.1 |  |  |  | 5.2 |
Less: expenditures |  |  | (2.3 | ) |  |  | (2.0 | ) |  |  | (3.5 | )
Ending balance |  | $ | 17.7 |  |  | $ | 16.8 |  |  | $ | 18.7 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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