Selected Balance Sheet Data

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of Dollars)	March 31, 2019			Dec. 31, 2018
Accounts receivable, net
Accounts receivable	$	98.7		$	96.3
Less allowance for bad debts	(5.5		)	(5.6		)
	$	93.2		$	90.7

(Millions of Dollars)	March 31, 2019		Dec. 31, 2018
Inventories
Materials and supplies	$	25.8	$	25.7
Fuel	8.5		8.2
	$	34.3	$	33.9

(Millions of Dollars)	March 31, 2019			Dec. 31, 2018
Property, plant and equipment, net
Electric plant	$	7,287.2		$	7,227.7
Construction work in progress	974.3			847.3
Total property, plant and equipment	8,261.5			8,075.0
Less accumulated depreciation	(2,173.0		)	(2,128.6		)
Total	$	6,088.5		$	5,946.4