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Derivative Instruments
 12 Months Ended
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
DERIVATIVE INSTRUMENTS
DERIVATIVE INSTRUMENTS

The following table shows our derivative assets and derivative liabilities:
 
 
December 31, 2016
 
December 31, 2015
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Other current
 
 
 
 
 
 
 
 
   Natural gas contracts
 
$
6.3

 
$
0.1

 
$
0.5

 
$
8.1

   Petroleum products contracts
 
0.2

 
0.1

 
0.9

 
3.3

   FTRs
 
3.1

 
—

 
1.6

 
—

   Coal contracts
 
1.5

 
0.5

 
1.7

 
3.4

   Total other current
 
$
11.1

 
$
0.7

 
$
4.7

 
$
14.8

 
 
 
 
 
 
 
 
 
Other long-term
 
 
 
 
 
 
 
 
   Natural gas contracts
 
$
0.5

 
$
—

 
$
—

 
$
1.3

   Petroleum products contracts
 
—

 
—

 
0.3

 
1.1

   Coal contracts
 
0.4

 
—

 
0.3

 
4.2

   Total other long-term
 
$
0.9

 
$
—

 
$
0.6

 
$
6.6

Total
 
$
12.0

 
$
0.7

 
$
5.3

 
$
21.4



Our estimated notional sales volumes and realized gains (losses) were as follows:
 
 
December 31, 2016
 
December 31, 2015
 
December 31, 2014
(in millions)
 
Volume
 
Gains (Losses)
 
Volume
 
Gains (Losses)
 
Volume
 
Gains
Natural gas contracts
 
35.3 Dth
 
$
(12.3
)
 
24.0 Dth
 
$
(12.6
)
 
21.4 Dth
 
$
4.0

Petroleum products contracts
 
10.3 gallons
 
(2.6
)
 
4.0 gallons
 
(0.2
)
 
9.2 gallons
 
0.5

FTRs
 
25.3 MWh
 
7.3

 
22.8 MWh
 
3.2

 
26.1 MWh
 
12.7

Total
 
 
 
$
(7.6
)
 
 
 
$
(9.6
)
 
 
 
$
17.2



At December 31, 2016, we had received cash collateral of $3.4 million in our margin accounts, and at December 31, 2015, we had posted cash collateral of $14.9 million 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, 2016
 
December 31, 2015
(in millions)
 
Derivative
Assets
 
Derivative Liabilities
 
Derivative
Assets
 
Derivative Liabilities
Gross amount recognized on the balance sheet
 
$
12.0

 
$
0.7

 
$
5.3

 
$
21.4

Gross amount not offset on the balance sheet *
 
(3.6
)
 
(0.2
)
 
(0.7
)
 
(13.5
)
Net amount
 
$
8.4

 
$
0.5

 
$
4.6

 
$
7.9


*
Includes cash collateral received of $3.4 million at December 31, 2016, and cash collateral posted of $12.8 million at December 31, 2015.