-- None. No documentation exists for this element. --

No definition available.

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- Definition

Fair value of shares (or other type of equity) for which the grantee exercised or converted the equity-based award into shares, other instruments, or cash in accordance with the terms of the arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	rdc_
Data Type:	xbrli:monetaryItemType
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- Definition

The aggregate fair value as of the grant date of equity-based award plans other than stock (unit) option plans.

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected Per Share Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	rdc_
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Balance Type:	na
Period Type:	instant

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	rdc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Definition

The weighted average fair value of outstanding awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

No definition available.

+ Details

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- Definition

The fair value of long term liabilities of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the number of shares of fully vested equity instruments other than stock options.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted-average grant-date fair value for equity instruments other than stock options that are fully vested.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Target Value, Per Share Amount

+ References

No definition available.

+ Details

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- Definition

The weighted average fair value of cancelled awards due to conversion to RSA unit on equity-based plans excluding option plans.

+ References

No definition available.

+ Details

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were cancelled due to conversion to RSA units during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	rdc_
Data Type:	xbrli:sharesItemType
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- Definition

The percentage of the performance unit value determined on annual performance.

+ References

No definition available.

+ Details

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Namespace Prefix:	rdc_
Data Type:	num:percentItemType
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- Definition

The percentage of the performance unit value determined on total vesting period performance.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination

+ References

No definition available.

+ Details

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Namespace Prefix:	rdc_
Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

+ References

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

+ Details

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

+ Details

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

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Period Type:	duration

- 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

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

+ Details

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Period Type:	instant

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

+ Details

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Data Type:	num:perShareItemType
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Period Type:	instant

- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

+ Details

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

+ Details

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Period Type:	duration

- Definition

Weighted average price of options that were either forfeited or expired.

+ References

+ Details

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Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

+ Details

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- References

No definition available.

+ Details

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- Definition

Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

+ Details

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

+ Details

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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SHARE-BASED COMPENSATION PLANS (Details) - USD ($)		12 Months Ended
SHARE-BASED COMPENSATION PLANS (Details) - USD ($)	Feb. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)					7,075,015
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Total compensation cost		$ 24,000,000	$ 29,000,000	$ 34,600,000
Unrecognized compensation cost related to nonvested share-based compensation arrangements					$ 28,200,000
Compensation expense over a remaining weighted-average period		1 year 7 months 12 days
Weighted-average grant-date fair value per share
Nonvested at end of period (in dollars per share)	$ 7.04
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.987%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	40.551%
Nonvested at end of period (in dollars per share)	$ 7.04
Minimum [Member]
Weighted-average grant-date fair value per share
Requisite service period		6 months
Non Employee Director Non-Deferred Restricted Share Units [Member]
Number of Shares
Outstanding, beginning of period (in shares)		91,000
Granted (in shares)		78,000
Vested / Settled (in shares)		(91,000)
Outstanding, end of period (in shares)		78,000	91,000
Vested at end of period (in shares)		0
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)		$ 13.24
Granted (in dollars per share)		15.29	$ 13.24
Vested / Settled (in dollars per share)		13.24
Outstanding, end of period (in dollars per share)		15.29	13.24
Vested at end of period (in dollars per share)		$ 0.00
Fair value of shares of common stock issued in connection with settlement of vested RSUs		$ 1,400,000
Granted (in dollars per share)		$ 15.29	$ 13.24
Restricted Shares And Restricted Share Units [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Total compensation cost		$ 18,000,000	$ 19,300,000	21,800,000
Restricted Shares And Restricted Share Units [Member] \| Maximum [Member]
Weighted-average grant-date fair value per share
Requisite service period		36 months
Share appreciation rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		33.33%
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Total compensation cost		$ 0	$ 0	$ 200,000
Awards vesting period		3 years
Weighted-average grant-date fair value per share
Expiration period		10 years
Number of shares under SARs
Outstanding at beginning of period (in shares)		1,029,000
Exercised (in shares)		0	0	0
Forfeited or expired (in shares)		(17,000)
Outstanding at end of period (in shares)		1,012,000	1,029,000
Grants (in shares)		0	0	0
Number of shares under SARs exercisable					1,012,000
Weighted-average exercise price
Outstanding at beginning of period (in dollars per share)		$ 31.03
Forfeited or expired (in dollars per share)		36.86
Outstanding at end of period (in dollars per share)		$ 30.93	$ 31.03
Exercisable at end of period (in dollars per share)					$ 30.93
Outstanding at end of period, Weighted-average remaining contractual term (in years)		2 years 8 days
Exercisable at end of period, Weighted-average remaining contractual term (in years)		2 years 8 days
Outstanding at end of period, Aggregate intrinsic value					$ 0
Exercisable at end of period, Aggregate intrinsic value					$ 0
Share options [Member]
Number of shares under SARs
Outstanding at beginning of period (in shares)		455,000
Exercised (in shares)		(5,000)	0	0
Forfeited or expired (in shares)		(95,000)
Outstanding at end of period (in shares)		355,000	455,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number					0
Weighted-average exercise price
Outstanding at beginning of period (in dollars per share)		$ 17.08
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		15.31
Forfeited or expired (in dollars per share)		15.31
Outstanding at end of period (in dollars per share)		$ 17.59	$ 17.08
Exercisable at end of period (in dollars per share)					$ 0.00
Outstanding at end of period, Weighted-average remaining contractual term (in years)		5 years 1 month 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 19,200
Outstanding at end of period, Aggregate intrinsic value					$ 0
Exercisable at end of period, Aggregate intrinsic value					$ 0
Share options [Member] \| Minimum [Member]
Weighted-average grant-date fair value per share
Requisite service period		3 years
Expiration period		7 years
Restricted shares [Member]
Number of Shares
Nonvested at beginning of period (in shares)		0
Granted (in shares)		367,000	0
Vested / Settled (in shares)		(141,000)
Nonvested at end of period (in shares)		226,000	0
Weighted-average grant-date fair value per share
Nonvested at beginning of period (in dollars per share)		$ 0.00
Granted (in dollars per share)		14.99	$ 18.60
Vested / Settled (in dollars per share)		15.18
Nonvested at end of period (in dollars per share)		$ 14.88	$ 0.00
Fair value of shares vested		$ 1,300,000	$ 758,000	$ 37,000
Granted (in dollars per share)		$ 14.99	$ 18.60
Weighted-average exercise price
Nonvested at end of period (in dollars per share)		$ 0.00	$ 0.00		$ 14.88	$ 0.00
Restricted share units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		33.33%
Number of Shares
Nonvested at beginning of period (in shares)		2,436,000
Granted (in shares)		1,334,000
Vested / Settled (in shares)		(1,004,000)
Forfeited (in shares)		(193,000)
Cancelled (in shares)		(367,000)
Nonvested at end of period (in shares)		2,206,000	2,436,000
Weighted-average grant-date fair value per share
Nonvested at beginning of period (in dollars per share)		$ 15.59
Granted (in dollars per share)		13.60	$ 17.09	$ 11.62
Vested / Settled (in dollars per share)		15.44
Forfeited (in dollars per share)		14.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled, Weighted Average Grant Date Fair Value		14.99
Nonvested at end of period (in dollars per share)		$ 14.67	$ 15.59
Fair value of shares vested		$ 13,700,000	$ 17,800,000	$ 14,600,000
Requisite service period		3 years
Granted (in dollars per share)		$ 13.60	$ 17.09	$ 11.62
Weighted-average exercise price
Nonvested at end of period (in dollars per share)		$ 15.59	$ 15.59		$ 14.67	$ 15.59
Non Employee Director Deferred Restricted Share Units [Member]
Number of Shares
Outstanding, beginning of period (in shares)		203,000
Granted (in shares)		26,000
Vested / Settled (in shares)		0	(114,000)	(54,000)
Outstanding, end of period (in shares)		229,000	203,000
Vested at end of period (in shares)		203,000
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)		$ 25.62
Granted (in dollars per share)		15.29	$ 13.24	$ 17.43
Vested / Settled (in dollars per share)		0.00
Outstanding, end of period (in dollars per share)		24.44	$ 25.62
Vested at end of period (in dollars per share)		25.62
Fair value of shares of common stock issued in connection with settlement of vested RSUs			$ 1,500,000	$ 1,000,000
Granted (in dollars per share)		$ 15.29	$ 13.24	$ 17.43
Non Employee Director Deferred and Non-Deferred Restricted Share Units [Member]
Weighted-average grant-date fair value per share
Fair value of long-term liabilities					$ 2,300,000	$ 3,800,000
Performance Shares [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Total compensation cost		$ 6,000,000	$ 9,700,000	$ 12,600,000
Weighted-average grant-date fair value per share
Performance-based awards, target value, per share amount		$ 100	$ 100	$ 100
Cash paid for units vested		$ 11,900,000	$ 11,400,000	$ 7,900,000
Weighted-average exercise price
Share-Based Compensation Arrangement By Share-Based Payment Award Equity Instruments Other Than Options, Aggregate Grant Date Fair Value1				$ 8,600,000	7,000,000	9,500,000
Performance Shares [Member] \| Maximum [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Awards vesting period		36 months
Other Current Liabilities [Member] \| Performance Shares [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Deferred Compensation Share-based Arrangements, Liability, Current					9,100,000	11,500,000
Other Liabilities [Member] \| Performance Shares [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Deferred Compensation Share-based Arrangements, Liability, Current					$ 7,000,000	$ 10,500,000
February 27, 2018 Grant [Member] \| Performance Shares [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Awards vesting period		3 years
February 27, 2018 Grant [Member] \| Performance Shares [Member] \| Minimum [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected Per Share Amount					$ 0
February 27, 2018 Grant [Member] \| Performance Shares [Member] \| Maximum [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected Per Share Amount					200
Granted in 2017 and 2016 [Member] \| Performance Shares [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Awards vesting period		3 years
Granted in 2017 and 2016 [Member] \| Performance Shares [Member] \| Minimum [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected Per Share Amount					0
Granted in 2017 and 2016 [Member] \| Performance Shares [Member] \| Maximum [Member]
Compensation cost charged to expense under all share-based incentive awards [Abstract]
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected Per Share Amount					$ 200
Granted During 2017 [Member] \| Share options [Member]
Weighted-average grant-date fair value per share
Requisite service period		4 years
Share-based Compensation Award, Tranche One [Member] \| February 27, 2018 Grant [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Unit Value Determined On Annual Performance		25.00%
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination		1 year
Share-based Compensation Award, Tranche One [Member] \| Granted in 2017 and 2016 [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Unit Value Determined On Annual Performance		25.00%
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination		1 year
Share-based Compensation Award, Total Period [Member] \| February 27, 2018 Grant [Member] \| Performance Shares [Member]
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Performance Unit Value Determined On Total Vesting Period Performance		25.00%
Share-based Compensation Award, Total Period [Member] \| Granted in 2017 and 2016 [Member] \| Performance Shares [Member]
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Performance Unit Value Determined On Total Vesting Period Performance		25.00%
Share-based Compensation Award, Tranche Two [Member] \| February 27, 2018 Grant [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Unit Value Determined On Annual Performance		25.00%
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination		1 year
Share-based Compensation Award, Tranche Two [Member] \| Granted in 2017 and 2016 [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Unit Value Determined On Annual Performance		25.00%
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination		1 year
Share-based Compensation Award, Tranche Three [Member] \| February 27, 2018 Grant [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Unit Value Determined On Annual Performance		25.00%
Weighted-average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Period For Value Determination		1 year