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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Summary of activities relating to the Company's CARO liabilities | The following table summarizes the activity relating to our CARO liabilities (in millions of dollars):
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Beginning balance |  | $ | 6.3 |  |  | $ | 5.9 |  |  | $ | 5.5 |
Liabilities settled during the period |  | (0.2 | ) |  | — |  |  | — |
Accretion expense |  | 0.5 |  |  | 0.4 |  |  | 0.4 |
Adjustment to accretion expense due to revisions to estimated cash flow and timing of expenditure 1 |  | (0.1 | ) |  | — |  |  | — |
Ending balance |  | $ | 6.5 |  |  | $ | 6.3 |  |  | $ | 5.9 |
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1. | The adjustments in 2019 had a $0.01 impact on both the basic and diluted net income per share for 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,
|  | 2019 |  | 2018 |  | 2017
Beginning balance |  | $ | 16.9 |  |  | $ | 16.6 |  |  | $ | 17.2 |
Additional accruals |  | 1.8 |  |  | 1.7 |  |  | 0.3 |
Less: expenditures |  | (1.7 | ) |  | (1.4 | ) |  | (0.9 | )
Ending balance |  | $ | 17.0 |  |  | $ | 16.9 |  |  | $ | 16.6 |

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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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