Amount of debt extinguishment costs expensed and not subject to amortization.

No definition available.

Name:	rdc_DebtExtinguishmentCostsExpensed
Namespace Prefix:	rdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument, Consolidated Debt to Total Capitalization Ratio

+ References

No definition available.

+ Details

Name:	rdc_DebtInstrumentConsolidatedDebttoTotalCapitalizationRatio
Namespace Prefix:	rdc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument in which a tender offer is made.

+ References

No definition available.

+ Details

Name:	rdc_DebtInstrumentFaceAmountOfTenderOffer
Namespace Prefix:	rdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents debt instrument issue amount as a percentage of principal during the period.

+ References

No definition available.

+ Details

Name:	rdc_DebtInstrumentIssueAmountAsPercentageOfPrincipal
Namespace Prefix:	rdc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to debt instrument redemption amount as a percentage of principal.

+ References

No definition available.

+ Details

Name:	rdc_DebtInstrumentRedemptionAmountAsPercentageOfPrincipal
Namespace Prefix:	rdc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Restrictive provisions in the entities debt agreements require the entity to maintain a minimum level of shareholders' equity equal to no less than the book value of outstanding debt.

+ References

No definition available.

+ Details

Name:	rdc_MinimumPercentageOfShareholdersEquity
Namespace Prefix:	rdc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Subsidiary, Ownership Percentage by Parent

+ References

No definition available.

+ Details

Name:	rdc_SubsidiaryOwnershipPercentagebyParent
Namespace Prefix:	rdc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

+ Details

Name:	us-gaap_EarlyRepaymentOfSeniorDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	rdc_LineOfCreditBorrowingCapacityPeriodAxis=rdc_Period1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rdc_LineOfCreditBorrowingCapacityPeriodAxis=rdc_Period2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rdc_LineOfCreditBorrowingCapacityPeriodAxis=rdc_Period3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_SubsidiaryIssuerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDueSeptember2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDueAugust2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDueJune2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDueJanuary2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDueJune2025MemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDueDecember2042Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDueJanuary2044Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdc_SeniorNotePayableDue2017and2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LONG-TERM DEBT (Details) - USD ($)				1 Months Ended		6 Months Ended	12 Months Ended
LONG-TERM DEBT (Details) - USD ($)	Feb. 08, 2017	Dec. 19, 2016	Jan. 15, 2014	Jan. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 09, 2017	May 31, 2015	Apr. 30, 2015
Debt Instrument [Line Items]
Current portion of long-term debt					$ 126,800,000		$ 126,800,000	$ 0
Long-term debt, less current portion					2,553,400,000		2,553,400,000	2,692,400,000
Long-term debt, carrying value					2,680,200,000		2,680,200,000	2,692,400,000
Long-term debt, principal amount					2,690,300,000		2,690,300,000
Proceeds from borrowings			$ 792,000,000				500,000,000	220,000,000	$ 793,400,000
Borrowing capacity under the revolving credit facility											$ 1,500,000,000.0	$ 1,000,000,000
Revolving credit facility, amount drawn					0		0
(Gain) loss on extinguishment of debt							$ 31,200,000	1,500,000	$ 0
Minimum percentage of shareholders equity							60.00%
Consolidated debt to total capitalization ratio							34.00%
Through January 23, 2019 [Member]
Debt Instrument [Line Items]
Borrowing capacity under the revolving credit facility					1,500,000,000.0		$ 1,500,000,000.0
January 24, 2019 through January 23, 2020 [Member]
Debt Instrument [Line Items]
Borrowing capacity under the revolving credit facility					1,440,000,000.00		1,440,000,000.00
January 24, 2020 through January 2021 [Member]
Debt Instrument [Line Items]
Borrowing capacity under the revolving credit facility					1,290,000,000.00		1,290,000,000.00
RCI [Member]
Debt Instrument [Line Items]
Subsidiary ownership percentage by parent			100.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Cash payment to retire long-term debt					490,500,000
Aggregate principal amount extinguished					463,900,000
(Gain) loss on extinguishment of debt					33,600,000
Debt instrument, face amount of tender offer					750,000,000		$ 750,000,000
Debt extinguishment costs					5,900,000
Debt extinguishment costs, expensed					5,300,000
Redemption amount as percentage of principal							100.00%
Senior Notes [Member] \| 5% Senior Notes, due September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying value					$ 92,000,000		$ 92,000,000	365,500,000
Effective interest rate					5.20%		5.20%
Long-term debt, principal amount					$ 92,200,000		$ 92,200,000	366,600,000
Stated interest rate					5.00%		5.00%
Aggregate principal amount extinguished					$ 265,500,000
Senior Notes [Member] \| 7.875 % Senior Notes, due August 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying value					$ 208,900,000		$ 208,900,000	432,900,000
Effective interest rate					8.00%		8.00%
Long-term debt, principal amount					$ 209,800,000		$ 209,800,000	435,500,000
Stated interest rate					7.875%		7.875%
Aggregate principal amount extinguished					$ 186,700,000
Senior Notes [Member] \| 4.875% Senior Notes, due June 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying value					$ 695,400,000		$ 695,400,000	706,200,000
Effective interest rate					4.70%		4.70%
Long-term debt, principal amount					$ 690,200,000		$ 690,200,000	700,000,000
Stated interest rate					4.875%		4.875%
Aggregate principal amount extinguished					$ 9,800,000
Senior Notes [Member] \| 4.75% Senior Notes, due January 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying value					$ 395,600,000		$ 395,600,000	397,100,000
Effective interest rate					4.80%		4.80%
Long-term debt, principal amount			$ 400,000,000		$ 398,100,000		$ 398,100,000	400,000,000
Stated interest rate					4.75%		4.75%
Issue amount as percentage of principal			99.898%
Aggregate principal amount extinguished					$ 1,900,000
Senior Notes [Member] \| 7.375% Senior Notes, due June 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying value					$ 497,200,000		$ 497,200,000
Effective interest rate					7.40%		7.40%
Long-term debt, principal amount		$ 500,000,000			$ 500,000,000		$ 500,000,000
Stated interest rate					7.375%		7.375%
Issue amount as percentage of principal		100.00%
Proceeds from borrowings		$ 492,000,000
Redemption amount as percentage of principal							101.00%
Senior Notes [Member] \| 5.4% Senior Notes due December 2042 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying value					$ 394,900,000		$ 394,900,000	394,700,000
Effective interest rate					5.40%		5.40%
Long-term debt, principal amount					$ 400,000,000		$ 400,000,000	400,000,000
Stated interest rate					5.40%		5.40%
Senior Notes [Member] \| 5.85% Senior Notes, due January 2044 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying value					$ 396,200,000		$ 396,200,000	396,000,000
Effective interest rate					5.90%		5.90%
Long-term debt, principal amount			$ 400,000,000		$ 400,000,000		$ 400,000,000	400,000,000
Stated interest rate					5.85%		5.85%
Issue amount as percentage of principal			99.972%
Senior Notes [Member] \| 5% Notes due 2017 and 7.875% Notes due 2019 [Member]
Debt Instrument [Line Items]
Cash payment to retire long-term debt						$ 45,200,000		101,100,000
Aggregate principal amount extinguished						47,900,000		97,900,000
(Gain) loss on extinguishment of debt						$ (2,400,000)		$ 1,500,000
Subsequent Event [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Cash payment to retire long-term debt				$ 32,800,000
Aggregate principal amount extinguished				34,600,000
Subsequent Event [Member] \| Senior Notes [Member] \| 5% Senior Notes, due September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount										$ 92,100,000
Cash payment to retire long-term debt	$ 94,000,000
Aggregate principal amount extinguished				100,000
Subsequent Event [Member] \| Senior Notes [Member] \| 7.875 % Senior Notes, due August 2019 [Member]
Debt Instrument [Line Items]
Aggregate principal amount extinguished				900,000
Subsequent Event [Member] \| Senior Notes [Member] \| 4.875% Senior Notes, due June 2022 [Member]
Debt Instrument [Line Items]
Aggregate principal amount extinguished				$ 33,600,000
Minimum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, commitment fee percentage							0.125%
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate							1.125%
Minimum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate							0.125%
Maximum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, commitment fee percentage							0.35%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate							2.00%
Maximum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate							1.00%