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DERIVATIVE INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative assets and derivative liabilities The following table shows our derivative assets and derivative liabilities:
 
 
June 30, 2019
 
December 31, 2018
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Other current
 
 
 
 
 
 
 
 
Natural gas contracts
 
$
4.6

 
$
22.5

 
$
7.7

 
$
5.3

FTRs
 
10.4

 
—

 
7.4

 
—

Coal contracts
 
0.5

 
0.1

 
0.2

 
0.1

Interest rate swaps
 
—

 
1.9

 
—

 
0.4

Total other current *
 
$
15.5

 
$
24.5


$
15.3


$
5.8

 
 
 
 
 
 
 
 
 
Other long-term
 
 
 
 
 
 
 
 
Natural gas contracts
 
$
—

 
$
1.8

 
$
0.4

 
$
0.2

Coal contracts
 
0.3

 
—

 
0.2

 
—

Interest rate swaps
 
—

 
4.8

 
—

 
1.9

Total other long-term *
 
$
0.3

 
$
6.6


$
0.6


$
2.1

Total
 
$
15.8

 
$
31.1

 
$
15.9

 
$
7.9



*
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 sales volumes and realized gain (losses) Our estimated notional sales volumes and realized gains (losses) were as follows:
 
 
Three Months Ended June 30, 2019
 
Three Months Ended June 30, 2018
(in millions)
 
Volumes
 
Gains (Losses)
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
43.8 Dth
 
$
(3.1
)
 
39.9 Dth
 
$
(2.3
)
Petroleum products contracts
 
— gallons
 
—

 
1.7 gallons
 
0.3

FTRs
 
8.0 MWh
 
3.0

 
6.8 MWh
 
3.9

Total
 
 
 
$
(0.1
)
 
 
 
$
1.9


 
 
Six Months Ended June 30, 2019
 
Six Months Ended June 30, 2018
(in millions)
 
Volumes
 
Gains (Losses)
 
Volumes
 
Gains (Losses)
Natural gas contracts
 
99.9 Dth
 
$
(3.6
)
 
88.0 Dth
 
$
(7.5
)
Petroleum products contracts
 
— gallons
 
—

 
3.8 gallons
 
0.8

FTRs
 
16.1 MWh
 
5.3

 
15.0 MWh
 
7.6

Total
 
 
 
$
1.7

 
 
 
$
0.9
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:
 
 
June 30, 2019
 
December 31, 2018
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Gross amount recognized on the balance sheet
 
$
15.8

 
$
31.1

 
$
15.9

 
$
7.9

 
Gross amount not offset on the balance sheet
 
(3.0
)
 
(24.2
)
(1) 
(4.0
)
(2) 
(4.9
)
(3) 
Net amount
 
$
12.8

 
$
6.9

 
$
11.9

 
$
3.0

 

(1)  
Includes cash collateral posted of $21.2 million.

(2)  
Includes cash collateral received of $0.2 million.

(3)  
Includes cash collateral posted of $1.1 million.
Amounts related to cash flow hedges recorded in other comprehensive loss and earnings
The table below shows the amounts related to these cash flow hedges recorded in other comprehensive loss and in earnings, along with our total interest expense on the income statements:
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(in millions)
 
2019
 
2018
 
2019
 
2018
Derivative losses recognized in other comprehensive loss
 
$
(3.2
)
 
$
—

 
$
(4.8
)
 
$
—

Net derivative gains reclassified from accumulated other comprehensive loss to interest expense
 
0.4

 
0.5

 
0.8

 
1.1

Total interest expense line item on the income statements
 
124.1

 
108.5

 
248.5

 
215.2