Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2016

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, 2016		December 31, 2015
Regulatory assets	$	686.6	$	697.0
Reserves for future remediation	617.7		628.0