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REGULATORY ENVIRONMENT - PGL QIP RIDER (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) Assurance	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Aug. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income	$ (786.2)		$ (710.3)
Reduction in revenues	(3,149.5)		(2,680.2)
Operation and maintenance expense	608.0		530.8
Interest expense	223.0		$ 192.0
Illinois Commerce Commission (ICC) \| PGL \| 2016 Annual QIP Rider Reconciliation
Public Utilities, General Disclosures [Line Items]
Disallowed capital costs				$ 14.8
Pre-tax charge to income		$ 25.3
Reduction in revenues		12.9
Operation and maintenance expense		12.1
Interest expense		$ 0.3
Illinois Commerce Commission (ICC) \| PGL \| QIP Rider Open Reconciliations 2017-2023
Public Utilities, General Disclosures [Line Items]
Aggregate capital costs during open reconciliation years	$ 2,800.0
Amount of assurance that QIP rider costs will be recoverable \| Assurance	0