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	$ 989.6	$ 981.0	$ 1,915.3	$ 1,939.6
Electric, affiliates	106.1	116.2	215.7	236.3
Natural gas	75.0	79.4	281.1	343.5
Other	9.2	8.4	18.0	16.1
Total operating revenues	1,179.9	1,185.0	2,430.1	2,535.5
Operating expenses
Electric fuel and purchased power	403.3	404.4	767.0	796.3
Cost of natural gas sold and transported	29.8	33.9	155.3	208.3
Cost of sales — other	5.7	5.4	11.3	10.6
Operating and maintenance expenses	290.3	305.5	586.1	617.4
Conservation program expenses	24.6	25.6	55.9	58.1
Depreciation and amortization	205.1	197.5	407.3	395.1
Taxes (other than income taxes)	63.0	65.4	131.6	135.0
Total operating expenses	1,021.8	1,037.7	2,114.5	2,220.8
Operating income	158.1	147.3	315.6	314.7
Other income (expense), net	3.0	(1.3)	(2.4)	0.2
Allowance for funds used during construction — equity	7.2	5.5	14.1	10.6
Interest charges and financing costs
Interest charges — includes other financing costs of $1.9, $1.8, $3.8 and $3.6, respectively	61.2	56.9	121.9	114.1
Allowance for funds used during construction — debt	(3.2)	(3.0)	(6.3)	(5.5)
Total interest charges and financing costs	58.0	53.9	115.6	108.6
Income before income taxes	110.3	97.6	211.7	216.9
Income tax (benefit) expense	(7.1)	1.7	(12.7)	7.8
Net income	$ 117.4	$ 95.9	$ 224.4	$ 209.1