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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information
Revenue	$ 726.4	$ 921.2
Operating income	193.3	174.9
Capital expenditures	174.3	103.7
Corporate, Non-Segment
Segment Reporting Information
Operating income	(2.1)	(0.8)
Capital expenditures	2.4	1.1
Operating Segments | Electric Utilities
Segment Reporting Information
Revenue	222.2	218.7
Operating income	64.6	61.1
Capital expenditures	86.9	47.8
Operating Segments | Gas Utilities
Segment Reporting Information
Revenue	508.7	706.9
Operating income	130.8	114.6
Capital expenditures	85.0	54.8
External Revenues
Segment Reporting Information
Revenue	726.4	921.2
External Revenues | Operating Segments | Electric Utilities
Segment Reporting Information
Revenue	219.3	215.9
External Revenues | Operating Segments | Gas Utilities
Segment Reporting Information
Revenue	507.1	705.3
Inter-segment Revenues | Corporate, Non-Segment
Segment Reporting Information
Revenue	(4.5)	(4.4)
Inter-segment Revenues | Operating Segments | Electric Utilities
Segment Reporting Information
Revenue	2.9	2.8
Inter-segment Revenues | Operating Segments | Gas Utilities
Segment Reporting Information
Revenue	$ 1.6	$ 1.6

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

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