Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue:
Revenue	$ 402.6	$ 411.3	$ 1,129.0	$ 1,332.4
Operating expenses:
Fuel, purchased power and cost of natural gas sold	107.1	121.3	423.7	647.5
Operations and maintenance	141.7	145.8	275.2	286.7
Depreciation and amortization	66.6	64.7	132.5	126.4
Taxes - property and production	16.6	16.0	33.6	33.4
Total operating expenses	332.0	347.8	865.0	1,094.0
Operating income	70.6	63.5	264.0	238.4
Other income (expense):
Interest expense incurred net of amounts capitalized	(48.2)	(43.3)	(94.2)	(87.3)
Interest income	5.6	1.8	7.5	2.3
Other income (expense), net	0.4	(1.5)	(0.5)	(0.9)
Total other income (expense)	(42.2)	(43.0)	(87.2)	(85.9)
Income before income taxes	28.4	20.5	176.8	152.5
Income tax benefit (expense)	(3.7)	6.1	(20.6)	(8.6)
Net income	24.7	26.6	156.2	143.9
Net income attributable to non-controlling interest	(1.9)	(3.5)	(5.6)	(6.8)
Net income available for common stock	$ 22.8	$ 23.1	$ 150.6	$ 137.1
Earnings per share of common stock:
Earnings per share, Basic (usd per share)	$ 0.33	$ 0.35	$ 2.2	$ 2.07
Earnings per share, Diluted (usd per share)	$ 0.33	$ 0.35	$ 2.19	$ 2.06
Weighted average common shares outstanding:
Basic (in shares)	69.0	66.6	68.6	66.3
Diluted (in shares)	69.0	66.7	68.7	66.4