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REGULATORY ENVIRONMENT - PGL QIP RIDER (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) Assurance	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) Assurance	Sep. 30, 2024 USD ($)	Aug. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income	$ (304.6)	$ (270.2)	$ (1,353.3)	$ (1,232.1)
Reduction in revenues	(2,104.0)	(1,863.5)	(7,263.0)	(6,315.7)
Operation and maintenance expense	605.1	566.8	1,809.3	1,631.0
Interest expense	223.6	204.2	667.4	$ 596.8
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	$ 2,900.0		$ 2,900.0
Amount of assurance that QIP rider costs will be recoverable | Assurance	0		0

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