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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information
Revenue	$ 402.6	$ 411.3	$ 1,129.0	$ 1,332.4
Operating income	70.6	63.5	264.0	238.4
Capital expenditures	206.5	151.8	380.8	255.5
Corporate, Non-Segment
Segment Reporting Information
Operating income	1.3	(0.8)	(0.6)	(1.7)
Capital expenditures	2.4	1.7	4.8	2.8
Operating Segments | Electric Utilities
Segment Reporting Information
Revenue	205.1	193.1	427.3	411.8
Operating income	46.3	46.6	110.9	107.7
Capital expenditures	98.7	52.1	185.6	99.9
Operating Segments | Gas Utilities
Segment Reporting Information
Revenue	202.0	222.7	710.6	929.6
Operating income	23.0	17.7	153.7	132.4
Capital expenditures	105.4	98.0	190.4	152.8
External Revenues
Segment Reporting Information
Revenue	402.6	411.3	1,129.0	1,332.4
External Revenues | Operating Segments | Electric Utilities
Segment Reporting Information
Revenue	202.1	190.2	421.4	406.1
External Revenues | Operating Segments | Gas Utilities
Segment Reporting Information
Revenue	200.5	221.1	707.6	926.3
Inter-segment Revenues | Corporate, Non-Segment
Segment Reporting Information
Revenue	(4.5)	(4.5)	(8.9)	(9.0)
Inter-segment Revenues | Operating Segments | Electric Utilities
Segment Reporting Information
Revenue	3.0	2.9	5.9	5.7
Inter-segment Revenues | Operating Segments | Gas Utilities
Segment Reporting Information
Revenue	$ 1.5	$ 1.6	$ 3.0	$ 3.3

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The net result for the period of deducting operating expenses from operating revenues.

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