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DERIVATIVE INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of derivative assets and liabilities The following table shows our derivative assets and derivative liabilities.
September 30, 2021December 31, 2020
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Current
Natural gas contracts$204.7 $20.6 $13.0 $12.9 
FTRs3.7 — 2.4 — 
Coal contracts38.7 — 1.6 0.8 
Interest rate swaps— 1.7 — 6.8 
Total current247.1 22.3 17.0 20.5 
Long-term
Natural gas contracts17.5 — 0.7 1.2 
Coal contracts5.5 — 0.2 0.4 
Total long-term23.0 — 0.9 1.6 
Total$270.1 $22.3 $17.9 $22.1 
Schedule of estimated notional sales volumes and realized gains (losses) Our estimated notional sales volumes and realized gains (losses) were as follows:
Three Months Ended September 30, 2021Three Months Ended September 30, 2020
(in millions)VolumesGainsVolumesGains (Losses)
Natural gas contracts
39.4 Dth
$41.2 
36.2 Dth
$(12.0)
FTRs
6.3 MWh
3.0 
8.3 MWh
1.1 
Total$44.2 $(10.9)
Nine Months Ended September 30, 2021Nine Months Ended September 30, 2020
(in millions)VolumesGainsVolumesGains (Losses)
Natural gas contracts
147.1 Dth
$38.5 
139.3 Dth
$(53.9)
FTRs
22.1 MWh
15.3 
22.7 MWh
3.1 
Total$53.8 $(50.8)
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, 2021December 31, 2020
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Gross amount recognized on the balance sheet$270.1 $22.3 $17.9 $22.1 
Gross amount not offset on the balance sheet(134.9)
(1)
(1.3)(6.9)(7.7)
(2)
Net amount$135.2 $21.0 $11.0 $14.4 

(1)Includes cash collateral received of $133.6 million.

(2)Includes cash collateral posted of $0.8 million.
Schedule of cash flow hedges recorded in other comprehensive income (loss) and earnings
The table below shows the amounts related to these cash flow hedges recorded in other comprehensive income (loss) and in earnings, along with our total interest expense on the income statements:
Three Months Ended September 30Nine Months Ended September 30
(in millions)2021202020212020
Derivative loss recognized in other comprehensive loss$— $— $— $(5.8)
Net derivative loss reclassified from accumulated other comprehensive loss to interest expense(1.4)(1.3)(4.1)(2.0)
Total interest expense line item on the income statements118.0 122.0 357.5 375.8