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Restructuring (Tables) | 12 Months Ended
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Dec. 31, 2020
Restructuring And Related Activities [Abstract] |
Summary of Activity Relating to Restructuring Plan Liabilities | The following table summarizes activity relating to restructuring plan liabilities (in millions of dollars):
|  | Year Ended December 31, 2020 |
Beginning balance |  | $ | — |
Restructuring costs |  |  | 12.4 |
Cash payments |  |  | (6.1 | )
Other adjustments1 |  |  | (4.9 | )
Ending balance |  | $ | 1.4 |
1. | In December 2020, we revised our production forecast for 2021, thereby reducing the estimated number of headcount reductions necessary as compared with our initial restructuring plan. As such, included in Other adjustments is a reduction to our estimated restructuring liability of $4.9 million with an offset to Restructuring costs to accommodate the revised headcount requirements.

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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