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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2022
Asset Retirement Obligation [Abstract]  
Reconciliation of changes in the asset retirement obligation
The following table provides a reconciliation of changes in the asset retirement obligation from operations during each period:
Years ended December 31,
20222021
Asset retirement obligation at beginning of year$12.3 $11.4 
Liabilities settled— (0.1)
Accretion expense(1)
0.9 0.9 
Revisions in estimated cash flows0.6 0.1 
Asset retirement obligation at end of year(2)
$13.8 $12.3 
(1)Included in cost of products sold and operating expenses on the Consolidated Statements of Income.
(2)The current portion of asset retirement obligation liabilities, which totaled $0.4 million and $0.7 million at December 31, 2022 and December 31, 2021, respectively, is classified in accrued liabilities on the Consolidated Balance Sheets.