Selected Balance Sheet Data

9 Months Ended

Sep. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Millions of Dollars)	Sept. 30, 2019			Dec. 31, 2018
Accounts receivable, net
Accounts receivable	$	119.5		$	96.3
Less allowance for bad debts	(5.6		)	(5.6		)
Accounts receivable, net	$	113.9		$	90.7

(Millions of Dollars)	Sept. 30, 2019		Dec. 31, 2018
Inventories
Materials and supplies	$	24.8	$	25.7
Fuel	6.6		8.2
Total inventories	$	31.4	$	33.9

(Millions of Dollars)	Sept. 30, 2019			Dec. 31, 2018
Property, plant and equipment, net
Electric plant	$	8,296.6		$	7,227.7
Construction work in progress	419.2			847.3
Total property, plant and equipment	8,715.8			8,075.0
Less accumulated depreciation	(2,273.9		)	(2,128.6		)
Property, plant and equipment, net	$	6,441.9		$	5,946.4