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DERIVATIVE INSTRUMENTS (Tables)
 3 Months Ended
Mar. 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.
March 31, 2024December 31, 2023
(in millions)Derivative
Assets		Derivative
Liabilities		Derivative
Assets		Derivative
Liabilities
Current
Natural gas contracts$4.1 $49.5 $10.4 $78.1 
FTRs and TCRs2.6 — 7.2 — 
Coal contracts0.2 10.9 0.3 10.9 
Total current6.9 60.4 17.9 89.0 
Long-term
Natural gas contracts0.3 3.1 0.1 8.0 
Coal contracts— 7.1 — 9.4 
Total long-term0.3 10.2 0.1 17.4 
Total$7.2 $70.6 $18.0 $106.4 
Schedule of estimated notional sales volumes and realized gains and losses Our estimated notional sales volumes and realized gains and losses were as follows:
Three Months Ended March 31, 2024Three Months Ended March 31, 2023
(in millions)VolumesGains (Losses)VolumesGains (Losses)
Natural gas contracts
67.8 Dth
$(56.9)
58.7 Dth
$(75.3)
FTRs and TCRs
7.6 MWh
1.6 
7.3 MWh
0.4 
Total$(55.3)$(74.9)
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:
March 31, 2024December 31, 2023
(in millions)Derivative
Assets		Derivative
Liabilities		Derivative
Assets		Derivative
Liabilities
Gross amount recognized on the balance sheet$7.2 $70.6 $18.0 $106.4 
Gross amount not offset on the balance sheet(1.8)(51.7)
(1)
(3.1)

(71.0)
(2)
Net amount$5.4 $18.9 $14.9 $35.4 

(1)Includes cash collateral posted of $49.9 million.

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