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	$	69.5	$	64.7
Less allowance for bad debts	(6.1)		(5.5)
Accounts receivable, net	$	63.4	$	59.2

(Millions of Dollars)	June 30, 2020		Dec. 31, 2019
Inventories
Materials and supplies	$	7.3	$	6.8
Fuel	4.1		4.0
Natural gas	2.0		5.2
Total inventories	$	13.4	$	16.0

(Millions of Dollars)	June 30, 2020		Dec. 31, 2019
Property, plant and equipment, net
Electric plant	$	3,070.6	$	3,024.6
Natural gas plant	375.2		365.5
Common and other property	203.7		201.5
Construction work in progress	120.4		82.8
Total property, plant and equipment	3,769.9		3,674.4
Less accumulated depreciation	(1,353.1)		(1,315.0)
Property, plant and equipment, net	$	2,416.8	$	2,359.4