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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative assets and liabilities | The following table shows our derivative assets and derivative liabilities:
|  | December 31, 2017 |  | December 31, 2016
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Other current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 5.6 |  |  | $ | 9.4 |  |  | $ | 31.4 |  |  | $ | 0.4 |
Petroleum products contracts |  | 1.2 |  |  | — |  |  | 0.2 |  |  | 0.1 |
FTRs |  | 4.4 |  |  | — |  |  | 5.1 |  |  | — |
Coal contracts |  | 0.6 |  |  | 0.6 |  |  | 1.5 |  |  | 1.4 |
Total other current |  | $ | 11.8 |  |  | $ | 10.0 |  |  | $ | 38.2 |  |  | $ | 1.9 |
Other long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 0.1 |  |  | $ | 1.4 |  |  | $ | 2.9 |  |  | $ | — |
Coal contracts |  | 0.5 |  |  | 0.2 |  |  | 0.5 |  |  | 0.5 |
Total other long-term |  | $ | 0.6 |  |  | $ | 1.6 |  |  | $ | 3.4 |  |  | $ | 0.5 |
Total |  | $ | 12.4 |  |  | $ | 11.6 |  |  | $ | 41.6 |  |  | $ | 2.4 |
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, 2017 |  | December 31, 2016 |  | December 31, 2015
(in millions) |  | Volume |  | Gains (Losses) |  | Volume |  | Gains (Losses) |  | Volume |  | Gains (losses)
Natural gas contracts |  | 123.1 Dth |  | $ | (8.0 | ) |  | 151.1 Dth |  | $ | (59.6 | ) |  | 86.2 Dth |  | $ | (50.5 | )
Petroleum products contracts |  | 18.0 gallons |  | (1.3 | ) |  | 14.7 gallons |  | (3.2 | ) |  | 7.8 gallons |  | (1.9 | )
FTRs |  | 36.2 MWh |  | 14.0 |  |  | 33.7 MWh |  | 13.3 |  |  | 27.3 MWh |  | 6.7 |
Total |  |  |  | $ | 4.7 |  |  |  |  | $ | (49.5 | ) |  |  |  | $ | (45.7 | )
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, 2017 |  | December 31, 2016
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Gross amount recognized on the balance sheet |  | $ | 12.4 |  |  | $ | 11.6 |  |  | $ | 41.6 |  |  | $ | 2.4 |
Gross amount not offset on the balance sheet |  | (4.9 | ) |  | (9.0 | ) | (1) | (4.9 | ) | (2) | (0.5 | )
Net amount |  | $ | 7.5 |  |  | $ | 2.6 |  |  | $ | 36.7 |  |  | $ | 1.9 |
(1) | Includes cash collateral posted of $4.1 million.
(2) | Includes cash collateral received of $4.4 million.

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of the amount of the realized gain (loss) and notional volumes for derivative instruments not designated as hedging instruments. + References No definition available. + Details
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