CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating revenues
Electric, non-affiliates	$ 194.9	$ 184.3	$ 523.6	$ 519.6
Electric, affiliates	41.0	44.7	123.5	132.3
Natural gas	14.5	14.6	78.7	96.6
Other	0.1	0.1	0.3	0.3
Total operating revenues	250.5	243.7	726.1	748.8
Operating expenses
Electric fuel and purchased power, non-affiliates	3.4	3.2	9.8	8.2
Purchased power, affiliates	99.5	94.9	285.0	298.3
Cost of natural sold and transported	5.5	5.4	33.5	45.9
Operating and maintenance expenses	47.0	47.5	140.5	150.8
Conservation program expenses	3.2	3.3	9.5	9.3
Depreciation and amortization	39.0	34.4	116.4	102.9
Taxes (other than income taxes)	6.9	7.3	21.0	22.0
Total operating expenses	204.5	196.0	615.7	637.4
Operating income	46.0	47.7	110.4	111.4
Other expense, net	(1.8)	(0.3)	(6.3)	(0.9)
Allowance for funds used during construction — equity	1.6	0.7	4.1	2.2
Interest charges and financing costs
Interest charges — includes other financing costs of $0.3, $0.3, $1.0 and $1.0, respectively	10.5	9.7	30.2	29.5
Other financing costs	0.3	0.3	1.0	1.0
Allowance for funds used during construction — debt	(0.7)	(0.3)	(1.7)	(0.9)
Total interest charges and financing costs	9.8	9.4	28.5	28.6
Income before income taxes	36.0	38.7	79.7	84.1
Income tax (benefit) expense	(3.5)	9.3	(5.5)	22.2
Net income	$ 39.5	$ 29.4	$ 85.2	$ 61.9