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CAPITAL STOCK (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Aug. 10, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Shares Issued in Debt to Equity Exchange | 2,300,000 | 1,800,000 | 1,800,000 |  | 2,300,000 |  |
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes |  |  | $ 10.0 |  |  |  |
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes | $ 4.5 | $ 12.6 |  |  | $ 4.5 |  |
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes | 10.5 |  |  |  | 10.5 |  |
Gain (loss) on extinguishment/restructuring of debt | $ (18.3) |  |  | $ 79.2 | $ 164.1 | $ 392.9 |
Common Stock, Shares, Issued |  |  |  |  | 44,400,000 |  |
Shares Issued, Price Per Share |  |  |  |  |  |  | $ 6.75
Net Proceeds from Issuance of Common Shares |  |  |  |  | $ 287.6 | $ 0.0 |
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Convertible Preferred Stock, Common Shares Issued Upon Conversion in Lieu of Dividend | 1,300,000 |  |  |  | 1,300,000 |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 0.9052 |  |  |  | 0.9052 |  |
Common shares, issued (in shares) | 26,500,000 |  |  |  | 26,500,000 |  |
Convertible Preferred Stock, Common Shares Issued Upon Conversion | 25,200,000 |  |  |  | 25,200,000 |  |
$218.5 Million 8.00% 2020 Lien Notes [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes | $ 11.4 |  |  |  | $ 11.4 |  |
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes | 17.9 |  |  |  | 17.9 |  |
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes | $ 30.5 |  |  |  | 30.5 |  |
Exchange of Debt for Equity [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Gain (loss) on extinguishment/restructuring of debt |  | $ 3.6 | $ 4.5 |  | $ 1.6 |  |
Minimum [Member] | Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 0.8621 |  |  |  | 0.8621 |  |

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