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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of derivative assets and liabilities None of the derivatives shown below were designated as hedging instruments.
December 31, 2023December 31, 2022
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Current
Natural gas contracts$10.4 $78.1 $32.5 $88.2 
FTRs and TCRs7.2 — 7.8 — 
Coal contracts0.3 10.9 18.9 — 
Total current17.9 89.0 59.2 88.2 
Long-term
Natural gas contracts0.1 8.0 — 8.4 
Coal contracts— 9.4 15.6 — 
Total long-term 0.1 17.4 15.6 8.4 
Total$18.0 $106.4 $74.8 $96.6 
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, 2023December 31, 2022December 31, 2021
(in millions)VolumesGains (Losses)VolumesGainsVolumesGains
Natural gas contracts
198.0 Dth
$(259.1)
183.3 Dth
$299.5 
197.6 Dth
$136.5 
FTRs and TCRs
30.2 MWh
25.9 
27.2 MWh
11.8 
28.2 MWh
17.7 
Total$(233.2)$311.3 $154.2 
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, 2023December 31, 2022
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Gross amount recognized on the balance sheet$18.0 $106.4 $74.8 $96.6 
Gross amount not offset on the balance sheet (3.1)(71.0)
(1)
(17.5)(82.5)
(2)
Net amount$14.9 $35.4 $57.3 $14.1 

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

(2)    Includes cash collateral posted of $65.0 million.