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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 05, 2016 | Jun. 30, 2016 | Nov. 23, 2016 | Aug. 04, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized shares of capital stock |  |  |  |  | 3,050.0 |  |
Authorized shares of common stock |  |  |  |  | 3,000.0 |  |
Authorized shares of preferred stock |  |  |  |  | 50.0 |  |
Issuance of common stock |  |  |  |  |  |  | $ 2,366.0
Proceeds from sale of common stock |  |  |  |  | $ 0.0 | $ 0.0 | 1,515.0
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 2,342.0
Dividends declared per share of common stock (in dollars per share) |  |  |  |  | $ 0.2 | $ 0 | $ 0
Common stocks |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock |  |  | $ 1,500.0 |  |  |  | $ 20.0
Stock Issued During Period, Shares, New Issues | 4.3 | 48.1 | 116.5 | 27.7 |  |  | 197.0
Shares Issued, Price Per Share |  |  | $ 12.87 |  |  |  |
Proceeds from sale of common stock | $ 29.0 |  | $ 1,500.0 | $ 311.0 |  |  |
Proceeds From Issuance Of Common Stock Net |  |  | 1,480.0 |  |  |  |
Payments of Stock Issuance Costs | $ 0.3 |  | $ 15.0 |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 369.0 |  |  |
Ultra-deepwater Drillship Contracts [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 48.1 |  |  |  |  |
Proceeds from sale of common stock |  | $ 540.0 |  |  |  |  |
Payments of Stock Issuance Costs |  | $ 5.0 |  |  |  |  |

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