Selected Balance Sheet Data

6 Months Ended

Jun. 30, 2020

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of Dollars)	June 30, 2020		Dec. 31, 2019
Accounts receivable, net
Accounts receivable	$	96.6	$	98.0
Less allowance for bad debts	(6.5)		(5.3)
Accounts receivable, net	$	90.1	$	92.7

(Millions of Dollars)	June 30, 2020		Dec. 31, 2019
Inventories
Materials and supplies	$	26.8	$	24.7
Fuel	6.7		6.3
Total inventories	$	33.5	$	31.0

(Millions of Dollars)	June 30, 2020		Dec. 31, 2019
Property, plant and equipment, net
Electric plant	$	8,690.9	$	8,453.0
Construction work in progress	802.4		485.4
Total property, plant and equipment	9,493.3		8,938.4
Less accumulated depreciation	(2,387.9)		(2,306.8)
Property, plant and equipment, net	$	7,105.4	$	6,631.6