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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory

Our inventory consisted of:
(in millions)
 
June 30, 2019
 
December 31, 2018
Materials and supplies
 
$
236.0

 
$
226.6

Natural gas in storage
 
130.5

 
232.9

Fossil fuel
 
94.9

 
88.7

Total
 
$
461.4

 
$
548.2