DERIVATIVE INSTRUMENTS - GAINS (LOSSES) AND NOTIONAL VOLUMES (Details) MWh in Millions, MMBTU in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2026
USD ($)
MWh
MMBTU
|
Sep. 30, 2025
USD ($)
MWh
MMBTU
|
Sep. 30, 2026
USD ($)
MWh
MMBTU
|
Sep. 30, 2025
USD ($)
MWh
MMBTU
|
|
| Realized gains and losses | ||||
| Gains (losses) | $ (3.4) | $ (7.0) | $ 15.5 | $ 2.4 |
| Natural gas contracts | Utility operations | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ (23.0) | $ (13.6) | $ (10.2) | $ (9.0) |
| Realized gains and losses on derivatives income statement location | Cost of sales | Cost of sales | Cost of sales | Cost of sales |
| Notional volumes | ||||
| Notional volumes | MMBTU | 39.5 | 37.6 | 151.1 | 146.4 |
| FTRs and TCRs | Non-Utility Energy Infrastructure | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ 0.0 | $ (0.1) | $ 0.1 | $ 0.0 |
| Realized gains and losses on derivatives income statement location | Total operating revenues | Total operating revenues | Total operating revenues | Total operating revenues |
| Notional volumes | ||||
| Notional volumes | MWh | 0.0 | 0.0 | 0.1 | 0.6 |
| FTRs and TCRs | Utility operations | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ 19.6 | $ 6.7 | $ 25.6 | $ 11.4 |
| Realized gains and losses on derivatives income statement location | Cost of sales | Cost of sales | Cost of sales | Cost of sales |
| Notional volumes | ||||
| Notional volumes | MWh | 6.6 | 6.8 | 18.5 | 20.6 |