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Regulatory Environment - PGL and NSG 2023 Rate Order (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 16, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Public Utilities, General Disclosures
Impairment related to ICC disallowances		$ 178.9	$ 0.0	$ 0.0
Illinois Commerce Commission (ICC) \| 2023 Rate Order
Public Utilities, General Disclosures
Impairment related to ICC disallowances		178.9
Illinois Commerce Commission (ICC) \| 2023 Rate Order \| PGL
Public Utilities, General Disclosures
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 related to ICC disallowances		177.2
Illinois Commerce Commission (ICC) \| 2023 Rate Order \| 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