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 ($)
MWh
MMBTU
|
Jun. 30, 2025
USD ($)
MWh
MMBTU
|
Jun. 30, 2026
USD ($)
MWh
MMBTU
|
Jun. 30, 2025
USD ($)
MWh
MMBTU
|
|
| Realized gains and losses | ||||
| Gains (losses) | $ (12.5) | $ 9.8 | $ 18.9 | $ 9.4 |
| Natural gas contracts | Utility operations | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ (16.8) | $ 6.5 | $ 12.8 | $ 4.6 |
| 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 | 48.6 | 47.3 | 111.6 | 108.8 |
| FTRs and TCRs | Non-Utility Energy Infrastructure | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ 0.0 | $ 0.3 | $ 0.1 | $ 0.1 |
| 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 | 0.3 | 0.1 | 0.6 |
| FTRs and TCRs | Utility operations | ||||
| Realized gains and losses | ||||
| Gains (losses) | $ 4.3 | $ 3.0 | $ 6.0 | $ 4.7 |
| 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 | 6.1 | 6.7 | 11.9 | 13.8 |