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COMMITMENTS AND CONTINGENCIES (Tables)
3 Months Ended
Mar. 31, 2020
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)
 
March 31, 2020
 
December 31, 2019
Regulatory assets
 
$
686.4

 
$
685.5

Reserves for future environmental remediation
 
589.4

 
589.2