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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative assets and 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:
 
 
December 31, 2018
 
December 31, 2017
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
Other current
 
 
 
 
 
 
 
 
   Natural gas contracts
 
$
7.7

 
$
5.3

 
$
5.6

 
$
9.4

   Petroleum products contracts
 
—

 
—

 
1.2

 
—

   FTRs
 
7.4

 
—

 
4.4

 
—

   Coal contracts
 
0.2

 
0.1

 
0.6

 
0.6

Interest rate swaps
 
—

 
0.4

 
—

 
—

   Total other current
 
$
15.3

 
$
5.8

 
$
11.8

 
$
10.0

 
 
 
 
 
 
 
 
 
Other long-term
 
 
 
 
 
 
 
 
   Natural gas contracts
 
$
0.4

 
$
0.2

 
$
0.1

 
$
1.4

   Coal contracts
 
0.2

 
—

 
0.5

 
0.2

Interest rate swaps
 
—

 
1.9

 
—

 
—

   Total other long-term
 
$
0.6

 
$
2.1

 
$
0.6

 
$
1.6

Total
 
$
15.9

 
$
7.9

 
$
12.4

 
$
11.6
Estimated notional volumes and realized gain (losses)
Our estimated notional sales volumes and realized gains (losses) were as follows for the years ended:
 
 
December 31, 2018
 
December 31, 2017
 
December 31, 2016
(in millions)
 
Volume
 
Gains
 
Volume
 
Gains (Losses)
 
Volume
 
Gains (losses)
Natural gas contracts
 
173.2 Dth
 
$
24.6

 
123.1 Dth
 
$
(8.0
)
 
151.1 Dth
 
$
(59.6
)
Petroleum products contracts
 
6.0 gallons
 
1.6

 
18.0 gallons
 
(1.3
)
 
14.7 gallons
 
(3.2
)
FTRs
 
30.5 MWh
 
15.9

 
36.2 MWh
 
14.0

 
33.7 MWh
 
13.3

Total
 
 
 
$
42.1

 
 
 
$
4.7

 
 
 
$
(49.5
)
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:
 
 
December 31, 2018
 
December 31, 2017
 
(in millions)
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
 
Gross amount recognized on the balance sheet
 
$
15.9

 
$
7.9

 
$
12.4

 
$
11.6

 
Gross amount not offset on the balance sheet
 
(4.0
)
(1) 
(4.9
)
(2) 
(4.9
)
 
(9.0
)
(3) 
Net amount
 
$
11.9

 
$
3.0

 
$
7.5

 
$
2.6

 

(1) 
Includes cash collateral received of $0.2 million.

(2)
Includes cash collateral posted of $1.1 million.

(3) 
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 at December 31:
(in millions)
 
2018
 
2017
 
2016
Amount of net derivative loss recognized in OCI
 
$
(2.9
)
 
$
—

 
$
—

Amount of net derivative gain reclassified from accumulated OCI to interest expense
 
1.6

 
2.2

 
2.2