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DERIVATIVE INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of derivative assets and liabilities
The following table shows our derivative assets and derivative liabilities, along with their classification on our balance sheets. None of our derivatives are designated as hedging instruments.
June 30, 2020December 31, 2019
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Other current
Natural gas contracts$0.7  $2.8  $0.4  $5.1  
FTRs2.8  —  1.5  —  
Coal contracts—  0.1  —  0.2  
Total other current (1)
3.5  2.9  1.9  5.3  
Other long-term
Natural gas contracts0.4  —  —  0.1  
Coal contracts—  —  0.1  —  
Total other long-term (1)
0.4  —  0.1  0.1  
Total$3.9  $2.9  $2.0  $5.4  

(1)On our balance sheets, we classify derivative assets and liabilities as other current or other long-term based on the maturities of the underlying contracts.
Schedule of estimated notional volumes and realized gains (losses) Our estimated notional sales volumes and realized gains (losses) were as follows:
Three Months Ended June 30, 2020Three Months Ended June 30, 2019
(in millions)VolumesGains (Losses)VolumesGains (Losses)
Natural gas contracts
14.0 Dth
$(4.4) 
13.6 Dth
$(1.1) 
FTRs
5.1 MWh
0.5  
5.6 MWh
0.5  
Total $(3.9)  $(0.6) 
Six Months Ended June 30, 2020Six Months Ended June 30, 2019
(in millions)VolumesGains (Losses)VolumesGains (Losses)
Natural gas contracts
33.1 Dth
$(11.3) 
31.7 Dth
$(2.5) 
FTRs
10.2 MWh
1.3  
11.1 MWh
2.1  
Total $(10.0)  $(0.4) 
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:
June 30, 2020December 31, 2019
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Gross amount recognized on the balance sheet$3.9  $2.9  $2.0  $5.4  
Gross amount not offset on the balance sheet(0.8) (2.8) 
(1)
(0.4) (5.2) 
(2)
Net amount$3.1  $0.1  $1.6  $0.2  

(1)Includes cash collateral posted of $2.0 million.

(2)Includes cash collateral posted of $4.8 million.