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COMMITMENTS AND CONTINGENCIES (Tables)
6 Months Ended
Jun. 30, 2018
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 related to manufactured gas plant sites:
(in millions)
 
June 30, 2018
 
December 31, 2017
Regulatory assets
 
$
669.9

 
$
676.6

Reserves for future remediation
 
617.2

 
617.2