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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of derivative assets and liabilities The following table shows our derivative assets and derivative liabilities. None of the derivatives shown below were designated as hedging instruments.
December 31, 2024December 31, 2023
(in millions)Derivative
Assets		Derivative
Liabilities		Derivative
Assets		Derivative
Liabilities
Current
Natural gas contracts$29.2 $13.9 $10.4 $78.1 
FTRs and TCRs7.8 — 7.2 — 
Coal contracts— — 0.3 10.9 
Total current37.0 13.9 17.9 89.0 
Long-term
Natural gas contracts4.1 — 0.1 8.0 
Coal contracts— — — 9.4 
Total long-term 4.1 — 0.1 17.4 
Total$41.1 $13.9 $18.0 $106.4 
Schedule of estimated notional sales volumes and realized gains (losses) Our estimated notional sales volumes and realized gains and losses were as follows for the years ended:
December 31, 2024December 31, 2023December 31, 2022
(in millions)VolumesGains (Losses)VolumesGains (Losses)VolumesGains
Natural gas contracts
206.3 Dth
$(127.8)
198.0 Dth
$(259.1)
183.3 Dth
$299.5 
FTRs and TCRs
29.7 MWh
8.2 
30.2 MWh
25.9 
27.2 MWh
11.8 
Total$(119.6)$(233.2)$311.3 
Schedule of net derivative instruments
The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
December 31, 2024December 31, 2023
(in millions)Derivative
Assets		Derivative
Liabilities		Derivative
Assets		Derivative
Liabilities
Gross amount recognized on the balance sheet$41.1 $13.9 $18.0 $106.4 
Gross amount not offset on the balance sheet (11.5)
(1)
(7.3)(3.1)(71.0)
(2)
Net amount$29.6 $6.6 $14.9 $35.4 

(1)    Includes cash collateral received of $4.2 million.

(2)    Includes cash collateral posted of $67.9 million.