RATE MATTERS - KPCo Rate Matters (Details) - USD ($) $ in Millions	1 Months Ended								12 Months Ended
	Jan. 31, 2025	Nov. 30, 2024	Feb. 29, 2024	Feb. 26, 2024	Jan. 31, 2024	Dec. 31, 2023	Nov. 30, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2024
Public Utilities, General Disclosures [Line Items]
Property, plant and equipment, net						$ 564.3			$ 564.3	$ 714.9
2023 Kentucky Base Rate and Securitization Case | KPCo
Public Utilities, General Disclosures [Line Items]
Requested annual increase								$ 94.0
Requested return on equity								9.90%
Requested securitization bonds regulatory assets recovery								$ 471.0
Kpco interest in mitchell plant								50.00%
Property, plant and equipment, net										$ 547.0
Settlement agreement annual increase							$ 75.0
Settlement agreement return on common equity							9.75%
Settlement agreement securitization bonds regulatory assets recovery							$ 471.0
Approved net increase in Kentucky annual revenues					$ 60.0
Approved return on equity					9.75%
Reduction in revenue requirement for recovery of actual test year pjm transmission costs				$ 14.0	$ 14.0
Regulatory assets expected to be recovered through securitization					491.0
Securitized plant retirement costs					303.0
Securitized deferred storm costs					79.0
Securitized purchased power expenses					50.0
Securitized under recovered rider costs					57.0
Securitized deferred issuance related expenses					2.0
2023 Kentucky Base Rate and Securitization Case | KPCo | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Reduction in revenue requirement for recovery of actual test year pjm transmission costs	$ 14.0
Order entered in mandated period	30 days
Fuel Adjustment Clause Review | KPCo
Public Utilities, General Disclosures [Line Items]
Review period						2 years
Purchased power cost recoveries						$ 432.0
Customer rate credits		$ 17.0
Fuel Adjustment Clause Review | KPCo | Minimum
Public Utilities, General Disclosures [Line Items]
Recommended disallowance from staff or intervenors						44.0
Fuel Adjustment Clause Review | KPCo | Maximum
Public Utilities, General Disclosures [Line Items]
Recommended disallowance from staff or intervenors						$ 60.0
Rockport Offset Recovery | KPCo
Public Utilities, General Disclosures [Line Items]
Requested recovery of allowed costs					$ 41.0
Estimated allowed costs recovered through rider			$ 18.0						$ 23.0