SEGMENT AND GEOGRAPHIC AREA INFORMATION - Segment (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment	2
Segment Reporting Information [Line Items]
Revenues	$ 1,843.2	$ 2,137.0	$ 1,824.4
Direct operating costs (excluding items below)	778.2	993.1	991.3
Depreciation and amortization	402.9	391.4	322.6
Selling, general and administrative	102.1	115.8	125.8
Other operating items	41.6	329.6	551.4
INCOME (LOSS) FROM OPERATIONS	518.4	307.1	(166.7)
Capital expenditures	117.6	722.9	1,958.2
Total assets (at end of year)	8,675.6	8,347.3	8,392.3
Deepwater [Member]
Segment Reporting Information [Line Items]
Revenues	827.5	747.8	179.8
Direct operating costs (excluding items below)	222.0	276.6	87.8
Depreciation and amortization	115.0	94.6	24.4
Selling, general and administrative	0.0	0.0	0.0
Other operating items	0.1	0.0	0.0
INCOME (LOSS) FROM OPERATIONS	490.4	376.6	67.6
Capital expenditures	31.5	555.1	1,577.2
Total assets (at end of year)	3,037.7	3,100.1	2,665.1
Jack-ups [Member]
Segment Reporting Information [Line Items]
Revenues	1,015.7	1,389.2	1,644.6
Direct operating costs (excluding items below)	556.2	716.5	903.5
Depreciation and amortization	282.6	283.9	283.5
Selling, general and administrative	0.0	0.0	0.0
Other operating items	40.9	328.8	544.9
INCOME (LOSS) FROM OPERATIONS	136.0	60.0	(87.3)
Capital expenditures	84.3	128.8	345.3
Total assets (at end of year)	4,285.8	4,437.9	5,163.0
Unallocated Costs and Other [Member]
Segment Reporting Information [Line Items]
Revenues	0.0	0.0	0.0
Direct operating costs (excluding items below)	0.0	0.0	0.0
Depreciation and amortization	5.3	12.9	14.7
Selling, general and administrative	102.1	115.8	125.8
Other operating items	0.6	0.8	6.5
INCOME (LOSS) FROM OPERATIONS	(108.0)	(129.5)	(147.0)
Capital expenditures	1.8	39.0	35.7
Total assets (at end of year)	$ 1,352.1	$ 809.3	$ 564.2

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
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Costs of generating revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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