OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES FOR UTILITY SEGMENT (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Operating Revenues
Operating revenues	$ 407.5	$ 410.5	$ 971.8	$ 909.2
Utility segment
Disaggregation of Operating Revenues
Operating revenues	407.5	410.5	971.8	909.2
Utility segment \| Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	1.0	0.9	2.2	2.1
Utility segment \| Transferred over time \| Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	406.5	409.6	969.6	907.1
Utility segment \| Electric \| Transferred over time \| Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	341.6	340.6	702.0	680.5
Utility segment \| Natural gas \| Transferred over time \| Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 64.9	$ 69.0	$ 267.6	$ 226.6

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