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OTHER ASSETS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Other Assets [Abstract] |  |  |  |  |
Investments in non-consolidated affiliates | $ 8.3 | $ 28.2 | $ 8.3 | $ 28.2 | $ 28.5
Deferred debt issuance costs | 2.1 | 2.7 | 2.1 | 2.7 | 2.5
Tax-related receivables | 4.9 | 13.1 | 4.9 | 13.1 | 10.2
Derivative contracts | 1.6 | 3.7 | 1.6 | 3.7 | 3.6
Supply contracts | 1,108.9 | 1,146.3 | 1,108.9 | 1,146.3 | 1,137.1
Other | 33.8 | 21.6 | 33.8 | 21.6 | 26.5
Other assets | 1,159.6 | 1,215.6 | 1,159.6 | 1,215.6 | 1,208.4
2017 Supply Contract Payment |  | 209.4 |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
2020 Supply Contract Payment |  |  |  |  | $ 389.2
2020 Supply Contract Payment Total Accretion |  | 51.8 |  | 51.8 |
2020 Supply Contract Payment Accretion Expense | 4.0 |  | 11.9 |  |
Amortization of Supply Contracts | $ 9.4 | $ 6.3 | 28.2 | $ 18.9 |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
BayGas non-cash impairment charge |  |  | $ 21.5 |  |
BayGas Olin ownership percentage | 9.10% |  | 9.10% |  |
BayGas Sempra ownership percentage | 90.90% |  | 90.90% |  |
Minimum |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
2020 Supply Contract Payment |  |  | $ 440.0 |  |
Maximum |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
2020 Supply Contract Payment |  |  | $ 465.0 |  |

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