Ownership Percentage of Senior Notes

No definition available.

Name:	cone_OwnershipPercentageofSeniorNotes
Namespace Prefix:	cone_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Parent Company's Ownership Percentage

+ References

No definition available.

+ Details

Name:	cone_ParentCompanysOwnershipPercentage
Namespace Prefix:	cone_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage Of Limited Partners Capital Account Units Purchased

+ References

No definition available.

+ Details

Name:	cone_PercentageOfLimitedPartnersCapitalAccountUnitsPurchased
Namespace Prefix:	cone_
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_CondensedFinancialStatementsCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

Name:	dei_LegalEntityAxis=cone_CyrusOneGPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=cone_SixPointThreeSevenFivePercentSeniorNotesDueTwoThousandTwentyTwoMember
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:	dei_LegalEntityAxis=cone_CyrusOneLpAndCyrusOneFinanceCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Guarantors - Narrative (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 20, 2012
Condensed Financial Statements, Captions [Line Items]
Long-term debt, net	$ 1,240,100,000	$ 996,500,000
CyrusOne GP
Condensed Financial Statements, Captions [Line Items]
Combined interest held on completion of transactions	1.00%
Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Long-term debt, net	$ 0	$ 0
Parent company's ownership percentage	100.00%
6.375% senior notes due 2022, including bond premium
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	6.375%	6.375%	6.375%
6.375% senior notes due 2022, including bond premium \| CyrusOne GP
Condensed Financial Statements, Captions [Line Items]
Ownership percentage of senior notes	100.00%
6.375% Senior Notes \| 6.375% senior notes due 2022, including bond premium
Condensed Financial Statements, Captions [Line Items]
Long-term debt, net	$ 477,300,000	$ 477,600,000
Stated interest rate	6.375%
6.375% Senior Notes \| 6.375% senior notes due 2022, including bond premium \| CyrusOne LP and CyrusOne Finance Corp
Condensed Financial Statements, Captions [Line Items]
Long-term debt, net				$ 525,000,000
Stated interest rate	6.375%			6.375%