CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating revenues
Electric, non-affiliates	$ 157.8	$ 164.4	$ 328.7	$ 335.3
Electric, affiliates	41.5	43.5	82.4	87.6
Natural gas	19.0	20.9	64.2	82.0
Other	0.2	0.1	0.2	0.2
Total operating revenues	218.5	228.9	475.5	505.1
Operating expenses
Electric fuel and purchased power, non-affiliates	3.4	3.1	6.3	5.0
Purchased power, affiliates	91.3	99.9	185.6	203.4
Cost of natural sold and transported	6.6	8.2	28.0	40.5
Operating and maintenance expenses	44.9	51.3	93.5	103.2
Conservation program expenses	3.2	3.1	6.3	6.0
Depreciation and amortization	38.8	34.4	77.4	68.5
Taxes (other than income taxes)	7.1	7.1	14.1	14.7
Total operating expenses	195.3	207.1	411.2	441.3
Operating income	23.2	21.8	64.3	63.8
Other expense, net	(1.8)	(0.3)	(4.3)	(0.6)
Allowance for funds used during construction — equity	1.4	0.9	2.5	1.4
Interest charges and financing costs
Interest charges — includes other financing costs of $0.4, $0.3, $0.7 and $0.7, respectively	9.9	9.8	19.8	19.8
Other financing costs	0.4	0.3	0.7	0.7
Allowance for funds used during construction — debt	(0.5)	(0.3)	(1.0)	(0.6)
Total interest charges and financing costs	9.4	9.5	18.8	19.2
Income before income taxes	13.4	12.9	43.7	45.4
Income tax expense (benefit)	1.3	4.3	(2.0)	12.8
Net income	$ 12.1	$ 8.6	$ 45.7	$ 32.6