ASSET RETIREMENT OBLIGATIONS	12 Months Ended
Dec. 31, 2021
ASSET RETIREMENT OBLIGATIONS [Abstract]
ASSET RETIREMENT OBLIGATIONS	NOTE 17: ASSET RETIREMENT OBLIGATIONSAsset retirement obligations (AROs) are legal obligations associated with the retirement of long-lived assets resulting from the acquisition, construction, development and/or normal use of the underlying assets, including legal obligations for land reclamation. Recognition of a liability for an ARO is required in the period in which it is incurred at its estimated fair value. The associated asset retirement costs are capitalized as part of the carrying amount of the underlying asset and depreciated over the estimated useful life of the asset. The liability is accreted through charges to operating expenses. If the ARO is settled for other than the carrying amount of the liability, we recognize a gain or loss on settlement.For the years ended December 31, ARO operating costs related to accretion of the liabilities and depreciation of the assets are as follows: in millions2021 2020 2019 ARO Operating Costs Accretion$ 13.1 $ 12.4 $ 11.0 Depreciation 10.6 8.6 7.1 Total$ 23.7 $ 21.0 $ 18.1 ARO operating costs are reported in cost of revenues. AROs are reported within other noncurrent liabilities in our accompanying Consolidated Balance Sheets. Reconciliations of the carrying amounts of our AROs for the years ended December 31 are as follows: in millions2021 2020 Asset Retirement Obligations Balance at beginning of year$ 283.2 $ 210.3 Liabilities incurred 19.2 0.4 Liabilities settled (11.0) (12.8) Accretion expense 13.1 12.4 Revisions, net 10.7 72.9 Balance at end of year$ 315.2 $ 283.2 ARO liabilities incurred during 2021 primarily relate to those assumed in the acquisition of U.S. Concrete (see Note 19). ARO revisions during 2020 primarily include increases in estimated costs at two aggregates locations, including reclamation activities required under a development agreement at an aggregates site on owned property in Southern California. The reclamation required under the development agreement will result in the restoration of previously mined property to conditions suitable for retail and commercial development.

ASSET RETIREMENT OBLIGATIONS

12 Months Ended

Dec. 31, 2021

ASSET RETIREMENT OBLIGATIONS [Abstract]

NOTE 17: ASSET RETIREMENT OBLIGATIONSAsset retirement obligations (AROs) are legal obligations associated with the retirement of long-lived assets resulting from the acquisition, construction, development and/or normal use of the underlying assets, including legal obligations for land reclamation. Recognition of a liability for an ARO is required in the period in which it is incurred at its estimated fair value. The associated asset retirement costs are capitalized as part of the carrying amount of the underlying asset and depreciated over the estimated useful life of the asset. The liability is accreted through charges to operating expenses. If the ARO is settled for other than the carrying amount of the liability, we recognize a gain or loss on settlement.For the years ended December 31, ARO operating costs related to accretion of the liabilities and depreciation of the assets are as follows: in millions2021 2020 2019 ARO Operating Costs Accretion$ 13.1 $ 12.4 $ 11.0 Depreciation 10.6 8.6 7.1 Total$ 23.7 $ 21.0 $ 18.1 ARO operating costs are reported in cost of revenues. AROs are reported within other noncurrent liabilities in our accompanying Consolidated Balance Sheets. Reconciliations of the carrying amounts of our AROs for the years ended December 31 are as follows: in millions2021 2020 Asset Retirement Obligations Balance at beginning of year$ 283.2 $ 210.3 Liabilities incurred 19.2 0.4 Liabilities settled (11.0) (12.8) Accretion expense 13.1 12.4 Revisions, net 10.7 72.9 Balance at end of year$ 315.2 $ 283.2 ARO liabilities incurred during 2021 primarily relate to those assumed in the acquisition of U.S. Concrete (see Note 19). ARO revisions during 2020 primarily include increases in estimated costs at two aggregates locations, including reclamation activities required under a development agreement at an aggregates site on owned property in Southern California. The reclamation required under the development agreement will result in the restoration of previously mined property to conditions suitable for retail and commercial development.