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Regulatory Environment - PGL and NSG 2023 Rate Order (Details) $ in Millions			3 Months Ended	12 Months Ended
	May 30, 2024 USD ($)	Nov. 16, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 20, 2025 in	Jun. 07, 2024 USD ($)
Public Utilities, General Disclosures
Impairment related to ICC disallowances				$ 12.1	$ 178.9	$ 0.0
2023 Rate Order \| Illinois Commerce Commission (ICC)
Public Utilities, General Disclosures
Impairment related to ICC disallowances			$ 178.9
2023 Rate Order \| Illinois Commerce Commission (ICC) \| PGL
Public Utilities, General Disclosures
Approved rate increase	$ 1.6	$ 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
Additional capital spending approved	$ 28.5
Impairment related to ICC disallowances			177.2
2023 Rate Order \| Illinois Commerce Commission (ICC) \| NSG
Public Utilities, General Disclosures
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 related to ICC disallowances			$ 1.7
2023 Rate Order \| Illinois Appellate Court
Public Utilities, General Disclosures
Disallowed capital costs								$ 237.9
2023 Rate Order \| Illinois Appellate Court \| PGL
Public Utilities, General Disclosures
Disallowance of future SMP capital investments								$ 116.0
SMP Proceedings \| Illinois Commerce Commission (ICC) \| PGL \| Subsequent event
Public Utilities, General Disclosures
Minimum diameter of pipe that does not require replacement \| in							36