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DERIVATIVE INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative assets and derivative liabilities
The following table shows our derivative assets and derivative liabilities:
 
 
June 30, 2018
 
December 31, 2017
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Other current
 
 
 
 
 
 
 
 
Natural gas contracts
 
$
5.6

 
$
1.8

 
$
5.6

 
$
9.4

Petroleum products contracts
 
0.4

 
—

 
1.2

 
—

FTRs
 
16.7

 
—

 
4.4

 
—

Coal contracts
 
0.5

 
0.3

 
0.6

 
0.6

   Total other current *
 
$
23.2

 
$
2.1


$
11.8


$
10.0

 
 
 
 
 
 
 
 
 
Other long-term
 
 
 
 
 
 
 
 
Natural gas contracts
 
$
0.4

 
$
0.5

 
$
0.1

 
$
1.4

Coal contracts
 
0.1

 
—

 
0.5

 
0.2

   Total other long-term *
 
$
0.5

 
$
0.5


$
0.6


$
1.6

Total
 
$
23.7

 
$
2.6

 
$
12.4

 
$
11.6



*
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.
Estimated notional volumes and realized gain (losses)
Our estimated notional sales volumes and realized gains (losses) were as follows:
 
 
Three Months Ended June 30, 2018

Three Months Ended June 30, 2017
(in millions)
 
Volumes
 
Gains (Losses)
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
39.9 Dth
 
$
(2.3
)
 
25.2 Dth
 
$
1.3

Petroleum products contracts
 
1.7 gallons
 
0.3

 
4.9 gallons
 
(0.4
)
FTRs
 
6.8 MWh
 
3.9

 
9.4 MWh
 
2.2

Total
 
 
 
$
1.9

 
 
 
$
3.1



 
 
Six Months Ended June 30, 2018
 
Six Months Ended June 30, 2017
(in millions)
 
Volumes
 
Gains (Losses)
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
88.0 Dth
 
$
(7.5
)
 
59.3 Dth
 
$
1.0

Petroleum products contracts
 
3.8 gallons
 
0.8

 
9.8 gallons
 
(0.9
)
FTRs
 
15.0 MWh
 
7.6

 
18.6 MWh
 
5.2

Total
 
 
 
$
0.9

 
 
 
$
5.3
Offsetting assets and liabilities
The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
 
 
June 30, 2018
 
December 31, 2017
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Gross amount recognized on the balance sheet
 
$
23.7

 
$
2.6

 
$
12.4

 
$
11.6

 
Gross amount not offset on the balance sheet
 
(2.1
)
 
(2.1
)
 
(4.9
)
 
(9.0
)
*
Net amount
 
$
21.6

 
$
0.5

 
$
7.5

 
$
2.6

 

*
Includes cash collateral posted of $4.1 million.