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OTHER ASSETS (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 05, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Other Assets [Abstract] |  |  |  |
Investments in non-consolidated affiliates |  | $ 27.2 | $ 25.2 | $ 26.7
Deferred debt issuance costs |  | 3.0 | 3.1 | 2.6
Tax-Related Receivable, Noncurrent |  | 16.1 | 14.4 | 17.5
Interest rate swaps |  | 8.3 | 0.0 | 7.7
Supply Contracts |  | 560.4 | 402.2 | 566.7
Other |  | 22.2 | 18.9 | 23.2
Other assets |  | 637.2 | 463.8 | 644.4
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Ethylene Asset | $ 416.1 |  |  |
2017 Supply Contract Payment |  | 209.4 |  |
Payments under long-term supply contract |  |  |  | $ (175.7)
Amortization of Supply Contracts |  | 6.3 | $ 4.3 |
Minimum |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
2020 Supply Contract Payment |  | 425.0 |  |
Maximum |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
2020 Supply Contract Payment |  | $ 465.0 |  |
DCP Business |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Payments for Supply of Ethylene | $ 433.5 |  |  |

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