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DERIVATIVE INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative assets and derivative liabilities
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. The following table shows our derivative assets and derivative liabilities:
 
 
September 30, 2018
 
December 31, 2017
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Other current
 
 
 
 
 
 
 
 
Natural gas contracts
 
$
9.7

 
$
4.5

 
$
5.6

 
$
9.4

Petroleum products contracts
 
—

 
—

 
1.2

 
—

FTRs
 
11.5

 
—

 
4.4

 
—

Coal contracts
 
0.4

 
—

 
0.6

 
0.6

   Total other current *
 
$
21.6

 
$
4.5


$
11.8


$
10.0

 
 
 
 
 
 
 
 
 
Other long-term
 
 
 
 
 
 
 
 
Natural gas contracts
 
$
0.2

 
$
0.4

 
$
0.1

 
$
1.4

Coal contracts
 
0.4

 
—

 
0.5

 
0.2

Interest rate swaps
 
0.8

 
—

 
—

 
—

   Total other long-term *
 
$
1.4

 
$
0.4


$
0.6


$
1.6

Total
 
$
23.0

 
$
4.9

 
$
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 September 30, 2018

Three Months Ended September 30, 2017
(in millions)
 
Volumes
 
Gains
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
36.7 Dth
 
$
0.4

 
24.9 Dth
 
$
(2.1
)
Petroleum products contracts
 
1.3 gallons
 
0.5

 
4.4 gallons
 
(0.5
)
FTRs
 
7.9 MWh
 
7.1

 
9.4 MWh
 
4.2

Total
 
 
 
$
8.0

 
 
 
$
1.6



 
 
Nine Months Ended September 30, 2018
 
Nine Months Ended September 30, 2017
(in millions)
 
Volumes
 
Gains (Losses)
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
124.7 Dth
 
$
(7.1
)
 
84.2 Dth
 
$
(1.1
)
Petroleum products contracts
 
5.1 gallons
 
1.3

 
14.2 gallons
 
(1.4
)
FTRs
 
22.9 MWh
 
14.7

 
28.0 MWh
 
9.4

Total
 
 
 
$
8.9

 
 
 
$
6.9
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:
 
 
September 30, 2018
 
December 31, 2017
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Gross amount recognized on the balance sheet
 
$
23.0

 
$
4.9

 
$
12.4

 
$
11.6

 
Gross amount not offset on the balance sheet
 
(3.7
)
(1) 
(3.6
)
 
(4.9
)
 
(9.0
)
(2) 
Net amount
 
$
19.3

 
$
1.3

 
$
7.5

 
$
2.6

 

(1) 
Includes cash collateral received of $0.1 million.

(2)  
Includes cash collateral posted of $4.1 million.
Amounts related to cash flow hedges recorded in OCI and earnings
The table below shows the amounts related to these cash flow hedges recorded in OCI and in earnings:
 
 
Three Months Ended September 30
 
Nine Months Ended September 30
(in millions)
 
2018
 
2017
 
2018
 
2017
Amount of net derivative gain recognized in OCI
 
$
0.4

 
$
—

 
$
0.4

 
$
—

Amount of net derivative gain reclassified from accumulated OCI to interest expense
 
0.2

 
0.6

 
1.3

 
1.7