RELATED PARTY TRANSACTIONS - Costs Paid (Details) - Barging, Urea Transloading And Other Transportion Services - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AEGCo
Related Party Transaction [Line Items]
Related party transaction, amount	$ 10.0	$ 9.3	$ 11.3
APPALACHIAN POWER COMPANY
Related Party Transaction [Line Items]
Related party transaction, amount	47.0	39.2	36.1
KPCo
Related Party Transaction [Line Items]
Related party transaction, amount	0.0	0.0	2.0
WPCo
Related Party Transaction [Line Items]
Related party transaction, amount	$ 7.5	$ 10.6	$ 4.7