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United Kingdom Energy Crisis and Impairment Charges (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Schedule of Impaired Intangible Assets | Assuming that all other assumptions utilized in our expected cash flows and the other inputs used in our long-lived asset test remained unchanged, a decrease of $5.00 per product ton in the average selling price or an increase of $0.50 per MMBtu in the cost of natural gas would have resulted in long-lived asset impairment for certain of the U.K. asset groups as the undiscounted cash flows would have been lower than their carrying values, and the resulting long-lived asset impairment charges for the fourth quarter of 2021 would have been as follows:
| Increase in |  |
| Long-lived Asset Impairment |  |
Assumption | (in millions)
| +$5.00 |  | -$5.00 |  |  |  |
Average Selling Price per Product Ton | $ | — |  |  | $ | 10 |  |  |  |  |
| +$0.50 |  | -$0.50 |  |  |  |
Natural Gas Cost per MMBtu(1) | $ | 13 |  |  | $ | — |  |  |  |  |
_______________________________________________________________________________(1)The sensitivity impact of a $0.50/MMBtu increase or decrease in the cost of natural gas includes any corresponding impact to selling prices from contractually stipulated sales provisions.

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- Definition Tabular disclosure of impaired intangible assets excluding goodwill. This may include a description of the facts and circumstances leading to the recording of impairment charges of intangible assets in the period, the amount of the impairment charges, the methods of determining fair value of the associated assets, the caption in the income statement in which the impairment losses are aggregated, and the segment in which the impaired intangible assets are reported. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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