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DERIVATIVE INSTRUMENTS (Tables)
 6 Months Ended
Jun. 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, along with their classification on our balance sheets.
June 30, 2021December 31, 2020
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Other current
Natural gas contracts$66.7 $5.8 $13.0 $12.9 
FTRs5.4 — 2.4 — 
Coal contracts6.1 0.1 1.6 0.8 
Interest rate swaps— 3.4 — 6.8 
Total other current (1)
78.2 9.3 17.0 20.5 
Other long-term
Natural gas contracts7.7 — 0.7 1.2 
Coal contracts0.9 0.1 0.2 0.4 
Total other long-term (1)
8.6 0.1 0.9 1.6 
Total$86.8 $9.4 $17.9 $22.1 

(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 sales volumes and realized gains (losses) Our estimated notional sales volumes and realized gains (losses) were as follows:
Three Months Ended June 30, 2021Three Months Ended June 30, 2020
(in millions)VolumesGainsVolumesGains (Losses)
Natural gas contracts
47.9 Dth
$4.8 
44.7 Dth
$(17.2)
FTRs
7.4 MWh
10.2 
7.2 MWh
0.6 
Total$15.0 $(16.6)
Six Months Ended June 30, 2021Six Months Ended June 30, 2020
(in millions)VolumesGains (Losses)VolumesGains (Losses)
Natural gas contracts
107.7 Dth
$(2.7)
103.1 Dth
$(41.9)
FTRs
15.8 MWh
12.3 
14.4 MWh
2.0 
Total$9.6 $(39.9)
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, 2021December 31, 2020
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Gross amount recognized on the balance sheet$86.8 $9.4 $17.9 $22.1 
Gross amount not offset on the balance sheet(51.0)
(1)
(0.5)(6.9)(7.7)
(2)
Net amount$35.8 $8.9 $11.0 $14.4 

(1)Includes cash collateral received of $50.5 million.

(2)Includes cash collateral posted of $0.8 million.
Schedule of cash flow hedges recorded in other comprehensive income (loss) and earnings
The table below shows the amounts related to these cash flow hedges recorded in other comprehensive income (loss) and in earnings, along with our total interest expense on the income statements:
Three Months Ended June 30Six Months Ended June 30
(in millions)2021202020212020
Derivative loss recognized in other comprehensive loss$— $(1.1)$— $(5.8)
Net derivative loss reclassified from accumulated other comprehensive loss to interest expense(1.3)(0.6)(2.7)(0.7)
Total interest expense line item on the income statements120.0 124.4 239.5 253.8