MATERIALS, SUPPLIES, AND INVENTORIES (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of inventory

Our inventory consisted of:

(in millions)	September 30, 2018		December 31, 2017
Fossil fuel	$	34.9	$	43.8
Materials and supplies	48.8		40.8
Natural gas in storage	30.2		22.4
Total	$	113.9	$	107.0