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REGULATORY ENVIRONMENT - PGL AND NSG 2023 RATE ORDER (Details) $ in Millions			3 Months Ended
	May 30, 2024 USD ($)	Nov. 16, 2023 USD ($)	Dec. 31, 2023 USD ($)	Feb. 20, 2025 in	Jun. 07, 2024 USD ($)
Illinois Commerce Commission (ICC) \| 2023 Rate Order
Public Utilities, General Disclosures [Line Items]
Impairment of property, plant, and equipment			$ 178.9
Illinois Commerce Commission (ICC) \| PGL \| 2023 Rate Order
Public Utilities, General Disclosures [Line Items]
Approved rate increase		$ 304.6
Approved rate increase (as a percent)		43.50%
Approved return on equity (as a percent)		9.38%
Approved common equity component average (as a percent)		50.79%
Disallowed capital costs		$ 236.2
Impairment of property, plant, and equipment			177.2
Illinois Commerce Commission (ICC) \| PGL \| May 2024 Rehearing Order
Public Utilities, General Disclosures [Line Items]
Approved rate increase	$ 1.6
Additional capital spend approved	$ 28.5
Illinois Commerce Commission (ICC) \| PGL \| SMP Proceedings
Public Utilities, General Disclosures [Line Items]
Minimum diameter of pipe that does not require replacement \| in				36
Illinois Commerce Commission (ICC) \| NSG \| 2023 Rate Order
Public Utilities, General Disclosures [Line Items]
Approved rate increase		$ 11.0
Approved rate increase (as a percent)		11.60%
Approved return on equity (as a percent)		9.38%
Approved common equity component average (as a percent)		52.58%
Disallowed capital costs		$ 1.7
Impairment of property, plant, and equipment			$ 1.7
Illinois Appellate Court \| 2023 Rate Order
Public Utilities, General Disclosures [Line Items]
Disallowed capital costs					$ 237.9
Illinois Appellate Court \| PGL \| 2023 Rate Order
Public Utilities, General Disclosures [Line Items]
Disallowance of future SMP capital investments					$ 116.0