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United Kingdom Energy Crisis and Impairment Charges (Tables)
12 Months Ended
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.