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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$59.3 $0.4 $3.7 $3.2 
FTRs1.6 — 1.1 — 
Coal contracts24.6 — 1.4 0.5 
Total current85.5 0.4 6.2 3.7 
Long-term
Natural gas contracts4.7 — 0.1 0.3 
Coal contracts4.2 — — 0.1 
Total long-term8.9 — 0.1 0.4 
Total$94.4 $0.4 $6.3 $4.1 
Schedule of estimated notional 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
15.9 Dth
$16.2 
12.7 Dth
$(4.1)
FTRs
5.4 MWh
1.1 
5.8 MWh
0.8 
Total$17.3 $(3.3)
Nine Months Ended September 30, 2021Nine Months Ended September 30, 2020
(in millions)VolumesGainsVolumesGains (Losses)
Natural gas contracts
51.5 Dth
$14.6 
45.8 Dth
$(15.4)
FTRs
16.5 MWh
7.6 
16.0 MWh
2.1 
Total $22.2  $(13.3)
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$94.4 $0.4 $6.3 $4.1 
Gross amount not offset on the balance sheet(38.9)
(1)
(0.1)(2.9)(2.9)
Net amount$55.5 $0.3 $3.4 $1.2 

(1)    Includes cash collateral received of $38.8 million.