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DERIVATIVE INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 2022
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.
September 30, 2022December 31, 2021
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Current
Natural gas contracts (1)
$135.0 $46.7 $60.6 $14.0 
FTRs and TCRs12.0 — 2.4 — 
Coal contracts44.0 — 44.0 — 
Total current191.0 46.7 107.0 14.0 
Long-term
Natural gas contracts (1)
6.4 2.9 4.0 1.1 
Coal contracts21.8 — 9.0 — 
Total long-term28.2 2.9 13.0 1.1 
Total$219.2 $49.6 $120.0 $15.1 
(1)Our natural gas derivative assets increased from December 31, 2021 to September 30, 2022 primarily due to the significant increase in natural gas prices.
Schedule of estimated notional sales volumes and realized gains Our estimated notional sales volumes and realized gains were as follows:
Three Months Ended September 30, 2022Three Months Ended September 30, 2021
(in millions)VolumesGainsVolumesGains
Natural gas contracts
32.7 Dth
$119.1 
39.4 Dth
$41.2 
FTRs and TCRs
7.0 MWh
7.4 
6.3 MWh
3.0 
Total$126.5 $44.2 
Nine Months Ended September 30, 2022Nine Months Ended September 30, 2021
(in millions)VolumesGainsVolumesGains
Natural gas contracts
133.3 Dth
$259.6 
147.1 Dth
$38.5 
FTRs and TCRs
21.0 MWh
12.7 
22.1 MWh
15.3 
Total$272.3 $53.8 
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:
September 30, 2022December 31, 2021
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Gross amount recognized on the balance sheet$219.2 $49.6 $120.0 $15.1 
Gross amount not offset on the balance sheet(42.5)
(1)
(27.8)
(2)
(15.2)
(3)
(9.2)
(4)
Net amount$176.7 $21.8 $104.8 $5.9 

(1)Includes cash collateral received of $16.4 million.

(2)Includes cash collateral posted of $1.7 million.

(3)Includes cash collateral received of $6.4 million.

(4)Includes cash collateral posted of $0.4 million.
Schedule of cash flow hedges reclassified to interest expense and total interest expense
The table below shows the amounts related to these cash flow hedges that were reclassified to interest expense, along with our total interest expense on the income statements:
Three Months Ended September 30Nine Months Ended September 30
(in millions)2022202120222021
Net derivative gain (loss) reclassified from accumulated other comprehensive loss to interest expense$0.1 $(1.4)$0.3 $(4.1)
Total interest expense line item on the income statements127.5 118.0 364.9 357.5