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Property, Plant, and Equipment - PGL and NSG Impairment (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2023	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, plant, and equipment
Other operation and maintenance			$ 2,158.0	$ 2,100.5	$ 1,938.0
PGL
Property, plant, and equipment
Disallowance of improvements to service center capital costs	$ 177.2
Other operation and maintenance		$ 12.1
NSG
Property, plant, and equipment
Disallowance of gas infrastructure project capital costs	1.7
PGL and NSG
Property, plant, and equipment
Non-cash impairment of PP&E	$ 178.9