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Reportable Segments - Depreciation and amortization expense by segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Depreciation and amortization expense by segment
Depreciation and amortization	$ 23.8	$ 21.4
Operating Segment \| Utilities
Depreciation and amortization expense by segment
Depreciation and amortization	14.2	14.1
Operating Segment \| Energy
Depreciation and amortization expense by segment
Depreciation and amortization	7.9	5.9
Corporate and non-allocated costs
Depreciation and amortization expense by segment
Depreciation and amortization	$ 1.7	$ 1.4

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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