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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 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, with the exception of our interest rate swaps, which have been designated as cash flow hedges.
December 31, 2020December 31, 2019
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Other current
Natural gas contracts$13.0 $12.9 $3.4 $21.8 
FTRs2.4 — 3.1 — 
Coal contracts1.6 0.8 0.2 0.2 
Interest rate swaps— 6.8 — 2.8 
Total other current17.0 20.5 6.7 24.8 
Other long-term
Natural gas contracts0.7 1.2 — 0.9 
Coal contracts0.2 0.4 0.2 — 
Interest rate swaps— — — 3.2 
Total other long-term 0.9 1.6 0.2 4.1 
Total$17.9 $22.1 $6.9 $28.9 
Schedule of estimated notional sales volumes and realized gains (losses) Our estimated notional sales volumes and realized gains (losses) were as follows for the years ended:
December 31, 2020December 31, 2019December 31, 2018
(in millions)VolumesGains (Losses)VolumesGains (Losses)VolumesGains
Natural gas contracts
188.6 Dth
$(54.1)
183.9 Dth
$(27.1)
173.2 Dth
$24.6 
Petroleum products contracts
— gallons
— 
 — gallons
— 
6.0 gallons
1.6 
FTRs
29.8 MWh
4.1 
31.2 MWh
16.3 
30.5 MWh
15.9 
Total$(50.0)$(10.8)$42.1 
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:
December 31, 2020December 31, 2019
(in millions)Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
Gross amount recognized on the balance sheet$17.9 $22.1 $6.9 $28.9 
Gross amount not offset on the balance sheet (6.9)

(7.7)
(1)
(1.4)(21.4)
(2)
Net amount$11.0 $14.4 $5.5 $7.5 

(1)    Includes cash collateral posted of $0.8 million.
(2)    Includes cash collateral posted of $20.0 million.
Schedule of cash flow hedges recorded in other comprehensive loss and earnings
The table below shows the amounts related to these cash flow hedges recorded in other comprehensive loss and in earnings, along with our total interest expense on the income statements, for the years ended December 31:
(in millions)202020192018
Derivative loss recognized in other comprehensive loss$(5.9)$(4.8)$(2.9)
Net derivative gain (loss) reclassified from accumulated other comprehensive loss to interest expense(2.1)1.1 1.6 
Total interest expense line item on the income statements493.7 501.5 445.1