MATERIALS, SUPPLIES, AND INVENTORIES (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Schedule of inventory

Our inventory consisted of:

(in millions)	March 31, 2017		December 31, 2016
Natural gas in storage	$	45.8	$	223.1
Materials and supplies	208.3		206.5
Fossil fuel	163.0		158.0
Total	$	417.1	$	587.6