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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 05, 2016 | Aug. 04, 2015 | Feb. 29, 2012 | Jun. 30, 2016 | Mar. 31, 2015 | Nov. 23, 2016 | Aug. 04, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 |  |  |  |  |  |  |  | $ 1,000.0 |  |  | $ 2,366.0 | $ 1,936.0
Proceeds from sale of common stock |  |  |  |  |  |  |  |  |  | $ 0.0 | 1,515.0 | $ 1,936.0
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 2,342.0 |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.1105 |  |  |  |  |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) |  |  | $ 1.25 |  | $ 0.20 |  |  |  |  | $ 0 | $ 0 | $ 0.2605
Common stocks |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 1,500.0 |  |  | $ 1,000.0 |  | $ 20.0 | $ 20.0
Stock Issued During Period, Shares, New Issues | 4.3 |  |  | 48.1 |  | 116.5 | 27.7 |  |  |  | 197.0 | 205.7
Shares Issued, Price Per Share |  |  |  |  |  | $ 12.87 |  | $ 9.53 |  |  |  | $ 9.53
Proceeds from sale of common stock | $ 29.0 |  |  |  |  | $ 1,500.0 | $ 311.0 |  |  |  |  | $ 1,960.0
Proceeds From Issuance Of Common Stock Net |  |  |  |  |  | 1,480.0 |  |  |  |  |  | 1,940.0
Payments of Stock Issuance Costs | $ 0.3 |  |  |  |  | $ 15.0 |  |  |  |  |  | $ 20.0
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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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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