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	$ 715.4	$ 692.7	$ 1,427.2	$ 1,434.2
Natural gas	186.2	207.6	517.7	676.7
Steam and other	9.5	9.7	22.9	22.1
Total operating revenue	911.1	910.0	1,967.8	2,133.0
Operating expenses
Electric Fuel and Purchased Power	258.4	240.7	529.2	544.9
Cost of natural Gas Sold and Transported	49.8	69.9	187.4	342.4
Cost of sales — steam and other	3.0	3.9	6.0	8.4
Operating and maintenance expenses	189.3	200.3	393.8	399.5
Demand side management expenses	36.1	32.2	71.7	64.4
Depreciation and amortization	158.1	148.1	314.5	295.0
Taxes (other than income taxes)	55.4	52.2	108.6	105.9
Total operating expenses	750.1	747.3	1,611.2	1,760.5
Operating income	161.0	162.7	356.6	372.5
Other income (expense), net	1.6	(0.3)	(0.2)	0.6
Allowance for funds used during construction — equity	11.4	5.0	20.0	9.1
Interest charges and financing costs
Interest charges — includes other financing costs of $1.8, $1.6, $3.5 and $3.2, respectively	62.9	57.7	123.0	117.1
Allowance for funds used during construction — debt	(4.7)	(2.4)	(8.5)	(4.9)
Total interest charges and financing costs	58.2	55.3	114.5	112.2
Income before income taxes	115.8	112.1	261.9	270.0
Income tax expense	7.7	10.6	25.1	29.7
Net income	$ 108.1	$ 101.5	$ 236.8	$ 240.3