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COMMITMENTS AND CONTINGENCIES (Tables)
6 Months Ended
Jun. 30, 2017
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, 2017
 
December 31, 2016
Regulatory assets
 
$
29.7

 
$
29.9

Reserves for future remediation
 
19.0

 
19.0