Selected Balance Sheet Data

6 Months Ended

Jun. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Millions of Dollars)	June 30, 2019			Dec. 31, 2018
Accounts receivable, net
Accounts receivable	$	98.6		$	96.3
Less allowance for bad debts	(5.3		)	(5.6		)
	$	93.3		$	90.7

(Millions of Dollars)	June 30, 2019		Dec. 31, 2018
Inventories
Materials and supplies	$	24.3	$	25.7
Fuel	6.9		8.2
	$	31.2	$	33.9

(Millions of Dollars)	June 30, 2019			Dec. 31, 2018
Property, plant and equipment, net
Electric plant	$	8,241.0		$	7,227.7
Construction work in progress	207.4			847.3
Total property, plant and equipment	8,448.4			8,075.0
Less accumulated depreciation	(2,219.9		)	(2,128.6		)
Total	$	6,228.5		$	5,946.4