Materials, Supplies and Inventories (Tables)

6 Months Ended

Jun. 30, 2015

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Our inventory consists of:

Materials, Supplies and Inventories	June 30, 2015		December 31, 2014
	(Millions of Dollars)
Fossil Fuel	$	182.4	$	125.6
Materials and Supplies	249.7		150.2
Natural Gas in Storage	130.4		124.8
Total	$	562.5	$	400.6

Schedule of LIFO liquidation balance sheet amount

The amounts as of June 30, 2015 were as follows:

		As of June 30, 2015
	Balance Sheet Presentation	PGL		NSG
		(Millions of Dollars)
Temporary LIFO liquidation debit	Other current assets	$	21.0	$	—
Temporary LIFO liquidation credit	Other current Liabilities	$	—	$	5.2