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DERIVATIVE INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative assets and derivative liabilities
The following table shows our derivative assets and derivative liabilities:
 
 
June 30, 2017
 
December 31, 2016
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Other current
 
 
 
 
 
 
 
 
   Natural gas contracts
 
$
4.3

 
$
4.1

 
$
31.4

 
$
0.4

   Petroleum products contracts
 
0.3

 
0.1

 
0.2

 
0.1

   FTRs
 
11.8

 
—

 
5.1

 
—

   Coal contracts
 
0.7

 
2.3

 
1.5

 
1.4

   Total other current *
 
$
17.1

 
$
6.5


$
38.2


$
1.9

 
 
 
 
 
 
 
 
 
Other long-term
 
 
 
 
 
 
 
 
   Natural gas contracts
 
$
0.4

 
$
0.4

 
$
2.9

 
$
—

   Coal contracts
 
—

 
1.1

 
0.5

 
0.5

   Total other long-term *
 
$
0.4

 
$
1.5


$
3.4


$
0.5

Total
 
$
17.5

 
$
8.0

 
$
41.6

 
$
2.4



*
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, 2017

Three Months Ended June 30, 2016
(in millions)
 
Volumes
 
Gains (Losses)
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
25.2 Dth
 
$
1.3

 
32.7 Dth
 
$
(20.0
)
Petroleum products contracts
 
4.9 gallons
 
(0.4
)
 
3.6 gallons
 
(1.0
)
FTRs
 
9.4 MWh
 
2.2

 
7.4 MWh
 
1.6

Total
 
 
 
$
3.1

 
 
 
$
(19.4
)

 
 
Six Months Ended June 30, 2017
 
Six Months Ended June 30, 2016
(in millions)
 
Volumes
 
Gains (Losses)
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
59.3 Dth
 
$
1.0

 
82.8 Dth
 
$
(53.5
)
Petroleum products contracts
 
9.8 gallons
 
(0.9
)
 
6.6 gallons
 
(2.1
)
FTRs
 
18.6 MWh
 
5.2

 
15.0 MWh
 
4.6

Total
 
 
 
$
5.3

 
 
 
$
(51.0
)
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, 2017
 
December 31, 2016
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Gross amount recognized on the balance sheet
 
$
17.5

 
$
8.0

 
$
41.6

 
$
2.4

Gross amount not offset on the balance sheet
 
(3.0
)
 
(3.8
)
(1) 
(4.9
)
(2) 
(0.5
)
Net amount
 
$
14.5

 
$
4.2

 
$
36.7

 
$
1.9


(1)  
Includes cash collateral posted of $0.8 million.

(2) 
Includes cash collateral received of $4.4 million.