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COMMITMENTS AND CONTINGENCIES (Tables)
9 Months Ended
Sep. 30, 2019
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)
 
September 30, 2019
 
December 31, 2018
Regulatory assets
 
$
719.6

 
$
687.1

Reserves for future environmental remediation
 
631.8

 
616.4