DERIVATIVE INSTRUMENTS - GAINS (LOSSES) AND NOTIONAL VOLUMES (Details) MWh in Millions, MMBTU in Millions, $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2026
USD ($)
MWh
MMBTU
|
Jun. 30, 2025
USD ($)
MMBTU
MWh
|
Jun. 30, 2026
USD ($)
MMBTU
MWh
|
Jun. 30, 2025
USD ($)
MWh
MMBTU
|
|
| Realized gains and losses | ||||
| Realized gains and losses on derivatives income statement location | Cost of sales | Cost of sales | Cost of sales | Cost of sales |
| Gains (losses) | $ (1.6) | $ 5.9 | $ 7.7 | $ 8.4 |
| Natural gas contracts | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ (5.4) | $ 4.6 | $ 4.0 | $ 6.1 |
| Notional volumes | ||||
| Notional volumes | MMBTU | 17.7 | 19.1 | 36.6 | 37.3 |
| FTRs | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ 3.8 | $ 1.3 | $ 3.7 | $ 2.3 |
| Notional volumes | ||||
| Notional volumes | MWh | 4.3 | 4.6 | 8.1 | 9.3 |