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Derivative Instruments
 12 Months Ended
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
DERIVATIVE INSTRUMENTS DERIVATIVE INSTRUMENTS
Derivative assets and liabilities are included in the other current and other long-term line items on our balance sheets. 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 
Realized gains and losses on derivatives used in our regulatory utility operations are recorded in cost of sales upon settlement; however, they may be subsequently deferred for future rate recovery or refund as the gains and losses are included in our utilities’ fuel and natural gas cost recovery mechanisms. Realized gains and losses on FTRs and TCRs used in our non-utility operations are recorded in operating revenues on the income statements. 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 

At December 31, 2024 and 2023, we had posted cash collateral of $16.0 million and $100.3 million, respectively. We had also received cash collateral of $4.2 million at December 31, 2024.

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.

Cash Flow Hedges

We previously entered into forward interest rate swap agreements to mitigate the interest rate exposure associated with the issuance of long-term debt related to the acquisition of Integrys. These swap agreements were settled in 2015, and we continue to amortize amounts out of accumulated other comprehensive loss into interest expense over the periods in which the interest costs are recognized in earnings. The derivative gains related to these swap agreements reclassified from accumulated other comprehensive loss to interest expense during the years ended December 31, 2024, 2023, and 2022 were not significant. At December 31, 2024, the amount expected to be reclassified from accumulated other comprehensive loss to interest expense over the next twelve months was also not significant.