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DERIVATIVE INSTRUMENTS
 12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
DERIVATIVE INSTRUMENTS DERIVATIVE INSTRUMENTS

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.
 
 
December 31, 2019
 
December 31, 2018
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Other current
 
 
 
 
 
 
 
 
Natural gas contracts
 
$
0.4

 
$
3.1

 
$
0.8

 
$
1.0

FTRs
 
1.3

 
—

 
3.0

 
—

Coal contracts
 
0.2

 
—

 
0.2

 
—

   Total other current
 
1.9

 
3.1

 
4.0

 
1.0

 
 
 
 
 
 
 
 
 
Other long-term
 
 
 
 
 
 
 
 
Natural gas contracts
 
—

 
0.1

 
—

 
0.1

Coal contracts
 
0.2

 
0.1

 
0.2

 
—

   Total other long-term
 
0.2

 
0.2

 
0.2

 
0.1

Total
 
$
2.1

 
$
3.3

 
$
4.2

 
$
1.1



Realized gains (losses) on derivatives are primarily recorded in cost of sales on the income statements. Our estimated notional sales volumes and realized gains (losses) were as follows for the years ended:
 
 
December 31, 2019
 
December 31, 2018
 
December 31, 2017
(in millions)
 
Volume
 
Gains (Losses)
 
Volume
 
Gains
 
Volume
 
Gains (Losses)
Natural gas contracts
 
35.4 Dth
 
$
(5.3
)
 
38.4 Dth
 
$
5.1

 
18.6 Dth
 
$
(2.4
)
Petroleum products contracts
 
— gallons
 
—

 
1.8 gallons
 
0.4

 
1.3 gallons
 
0.1

FTRs
 
9.1 MWh
 
7.2

 
9.3 MWh
 
12.5

 
9.1 MWh
 
6.4

Total
 
 
 
$
1.9

 
 
 
$
18.0

 
 
 
$
4.1



At December 31, 2019 and 2018, we had posted cash collateral of $4.8 million and $0.5 million, respectively, in our margin accounts.

The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
 
 
December 31, 2019
 
December 31, 2018
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
 
Gross amount recognized on the balance sheet
 
$
2.1

 
$
3.3

 
$
4.2

 
$
1.1

 
Gross amount not offset on the balance sheet
 
(0.3
)
 
(3.1
)
(1) 
(0.8
)
 
(1.1
)
(2) 
Net amount
 
$
1.8

 
$
0.2

 
$
3.4

 
$
—

 

(1)  
Includes cash collateral posted of $2.8 million.

(2)  
Includes cash collateral posted of $0.3 million.