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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]  
Schedule of regulatory assets and reserves related to manufactured gas plant sites
We have established the following regulatory assets and reserves for manufactured gas plant sites:
(in millions)June 30, 2022December 31, 2021
Regulatory assets$621.6 $630.9 
Reserves for future environmental remediation504.3 532.6