Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number of Individuals

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Measurement Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value, Nonvested

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

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- Definition

Share-based Compensation by Share-based Payment Award, Cap on Vesting, Percent

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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No definition available.

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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.

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-Publisher FASB
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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).

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-Publisher FASB
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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

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-Publisher FASB
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- 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.

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No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Publisher FASB
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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.

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- Definition

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

+ References

No definition available.

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- Definition

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

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

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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

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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.

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- Definition

Number of non-vested options outstanding.

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- Definition

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

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Stock-Based Compensation Plans - Narrative (Details) $ / shares in Units, $ in Millions					12 Months Ended
	Feb. 10, 2015	Feb. 07, 2014	Apr. 17, 2013 $ / shares	Jan. 24, 2013 USD ($) shares	Dec. 31, 2015 USD ($) executive shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					223,186
Number of shares (in shares)					333,979	166,872	168,963
Exercised (in dollars per share)					2,525	0	0
Intrinsic value of options outstanding \| $					$ 3.7
Intrinsic value of options exercisable \| $					$ 0.9
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)					571,224
Unvested balance (in shares)					1,585,481.000000	1,739,642	1,126,669
2012 LTIP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)					4,000,000
Shares available for grant (in shares)					1,500,000
Founders \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)				1,000,000
Other than options grant date value \| $				$ 19.0
Award vesting period				3 years
Unrecognized compensation expense, other than options \| $					$ 0.3
Unrecognized compensation expense, period for recognition					1 month 6 days
2013 Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price for options granted \| $ / shares			$ 23.58
2013 Grants \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)							4,361
Other than options grant date value \| $							$ 0.1
Award vesting period							3 years
Unrecognized compensation expense, other than options \| $					$ 0.1
Unrecognized compensation expense, period for recognition					3 months 18 days
2013 Grants \| Restricted Stock \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							1 year
2013 Grants \| Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Award vesting rights percentage			50.00%
2013 Grants \| Performance Awards \| Below 90% of EBITDA Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			0.00%
2013 Grants \| Performance Awards \| At 90% of EBITDA Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			50.00%
2013 Grants \| Performance Awards \| At 100% of EBITDA Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			100.00%
2013 Grants \| Performance Awards \| At or above 115% of EBITDA Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			200.00%
2013 Grants \| Market based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Award vesting rights percentage			50.00%
Measurement period			3 years
2013 Grants \| Market based restricted stock \| If CyrusOne's total stockholder return is less than the return of the Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			0.00%
2013 Grants \| Market based restricted stock \| If CyrusOne's total stockholder return is equal to or greater than the return of the Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			100.00%
2013 Grants \| Market based restricted stock \| if CyrusOne's total stockholder return exceeds the return of the Index by 2%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			200.00%
2013 Grants \| Market based restricted stock \| If CyrusOne's total stockholder return exceeds the return of the Index, but is negative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage			50.00%
2013 Grants \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period for award			10 years
2014 Grants \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)						46,313
Other than options grant date value \| $						$ 1.0
Award vesting period						3 years
Unrecognized compensation expense, other than options \| $					$ 1.3
Unrecognized compensation expense, period for recognition					1 year 1 month 6 days
2014 Grants \| Restricted Stock \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						1 year
2014 Grants \| Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Award vesting rights percentage		50.00%
Performance period		3 years
2014 Grants \| Market based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Award vesting rights percentage		50.00%
2015 Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, other than options \| $					$ 5.6
Unrecognized compensation expense, period for recognition					1 year 7 months 6 days
2015 Grants \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)					29,424
Award vesting period	3 years
Award vesting rights percentage	25.00%
2015 Grants \| Restricted Stock \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)					8,157
Award vesting period					3 years
2015 Grants \| Performance and market based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage	75.00%
2015 Grants \| Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)					11,711
Measurement period	3 years
Performance period					3 years
Cap on award vesting	100.00%
2015 Grants \| Performance Awards \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options issued (in shares)					55,301
Performance period					3 years
2015 Grants \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Granted (in shares)					12,719
2015 Grants \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost \| $					$ 2.4
Number of individuals with accelerated vesting \| executive					2