OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES FOR UTILITY SEGMENT (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Operating Revenues
Revenues	$ 410.5	$ 337.0	$ 909.2	$ 764.2
Utility segment
Disaggregation of Operating Revenues
Revenues	410.5	337.0	909.2	764.2
Utility segment \| Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	0.9	(1.1)	2.1	0.1
Utility segment \| Transferred over time \| Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	409.6	338.1	907.1	764.1
Utility segment \| Electric \| Transferred over time \| Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	340.6	286.8	680.5	587.1
Utility segment \| Natural gas \| Transferred over time \| Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 69.0	$ 51.3	$ 226.6	$ 177.0

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