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Accounting for Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting for Asset Retirement Obligations [Abstract] |
Reconciliation of Asset Retirement Obligations | The following is a reconciliation of asset retirement obligations as of December 31, 2020 and 2019:
|  | December 31, |
(millions of dollars) |  | 2020 |  |  | 2019 |
Asset retirement obligation, beginning of period |  | $ | 23.9 |  |  | $ | 23.4 |
Accretion expense |  |  | 2.3 |  |  |  | 2.7 |
Other |  |  | 1.1 |  |  |  | 1.1 |
Payments |  |  | (3.4 | ) |  |  | (3.3 | )
Foreign currency translation |  |  | 0.2 |  |  |  | — |
Asset retirement obligation, end of period |  | $ | 24.1 |  |  | $ | 23.9 |

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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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