Consolidated Total Leverage Ratio

No definition available.

Name:	out_ConsolidatedTotalLeverageRatio
Namespace Prefix:	out_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant, Maximum Consolidated Net Secured Coverage Ratio, REIT Election

+ References

No definition available.

+ Details

Name:	out_DebtCovenantMaximumConsolidatedNetSecuredCoverageRatioREITElection
Namespace Prefix:	out_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant, Maximum Consolidated Total Leverage Ratio

+ References

No definition available.

+ Details

Name:	out_DebtCovenantMaximumConsolidatedTotalLeverageRatio
Namespace Prefix:	out_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant Restricted Cash Limit

+ References

No definition available.

+ Details

Name:	out_DebtCovenantRestrictedCashLimit
Namespace Prefix:	out_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Maximum Consolidated Net Secured Leverage Ratio

+ References

No definition available.

+ Details

Name:	out_MaximumConsolidatedNetSecuredLeverageRatio
Namespace Prefix:	out_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Wholly-Owned Subsidiaries

+ References

No definition available.

+ Details

Name:	out_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix:	out_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage Of Debt Instrument Outstanding

+ References

No definition available.

+ Details

Name:	out_PercentageOfDebtInstrumentOutstanding
Namespace Prefix:	out_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage Of Redeemable Debt Instrument Outstanding

+ References

No definition available.

+ Details

Name:	out_PercentageOfRedeemableDebtInstrumentOutstanding
Namespace Prefix:	out_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ 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(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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

- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ 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 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentDateOfFirstRequiredPayment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ 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

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt premium.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

+ Details

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

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
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 debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=out_TermLoanDue2026Member
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=out_SeniorNotesDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=out_SeniorNotesDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_LongTermDebtMember
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:	srt_RangeAxis=srt_MaximumMember
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:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Narrative (Details) - Debt Instruments $ in Millions			1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
Debt - Narrative (Details) - Debt Instruments $ in Millions	May 15, 2020 USD ($) subsidiary	Apr. 15, 2020	May 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 15, 2022
Debt Instrument [Line Items]
Number Of Wholly-Owned Subsidiaries \| subsidiary	2
Long-term debt, net				$ 2,618.4	$ 2,618.4		$ 2,222.1
Debt Instrument, Date of First Required Payment				Dec. 15, 2020
Repayments of Long-term Debt					$ 495.0	$ 55.0
Debt Covenant, Consolidated Total Leverage Ratio					6.0
Consolidated Total Leverage Ratio					6.7
Deferred financing costs				$ 36.1	$ 36.1
Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Long-term debt at fair value				$ 2,600.0	$ 2,600.0		$ 2,500.0
Secured debt \| Term loan, due 2026
Debt Instrument [Line Items]
Interest rate at period end				1.90%	1.90%
Unamortized debt discount				$ 2.3	$ 2.3
Senior unsecured notes, due date					Nov. 18, 2026		Nov. 18, 2026
Senior unsecured notes \| 5.625% senior unsecured notes, due 2024
Debt Instrument [Line Items]
Stated interest rate				5.625%	5.625%		5.625%
Senior unsecured notes, due date					Feb. 15, 2024		Feb. 15, 2024
Unamortized premium				$ 1.5	$ 1.5
Debt face amount				$ 100.0	$ 100.0
Senior unsecured notes \| 6.250% senior unsecured notes, due 2025
Debt Instrument [Line Items]
Stated interest rate	6.25%			6.25%	6.25%
Senior unsecured notes, due date	Jun. 15, 2025				Jun. 15, 2025
Revolving credit facility
Debt Instrument [Line Items]
Repayments of Long-term Debt			$ 400.0
Long-term debt \| Secured debt \| Term loan, due 2026
Debt Instrument [Line Items]
Long-term debt, net				$ 597.7	$ 597.7		$ 597.5
Long-term debt \| Senior unsecured notes
Debt Instrument [Line Items]
Long-term debt, net				2,051.5	2,051.5		1,651.7
Long-term debt \| Senior unsecured notes \| 5.625% senior unsecured notes, due 2024
Debt Instrument [Line Items]
Long-term debt, net				501.5	501.5		501.7
Long-term debt \| Senior unsecured notes \| 6.250% senior unsecured notes, due 2025
Debt Instrument [Line Items]
Long-term debt, net	$ 400.0			400.0	$ 400.0		$ 0.0
Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, covenant description		On April 15, 2020, the Company, along with the Borrowers, and other guarantor subsidiaries party thereto, entered into an amendment (the “Amendment”) to the Credit Agreement. The Amendment provides that for the period from April 15, 2020 through September 30, 2021 (i) the Company’s Consolidated Net Secured Leverage Ratio shall be calculated by substituting the Company’s Consolidated EBITDA for each of the quarterly periods ended June 30, 2020 and September 30, 2020, included in any last twelve month compliance testing period, with the Company’s historical Consolidated EBITDA for each of the quarterly periods ended June 30, 2019 and September 30, 2019, respectively; and (ii) the Company will not make any Restricted Payments (as defined in the Credit Agreement) without the consent of the applicable lenders under the Credit Agreement, subject to certain exceptions such as payments necessary to maintain the Company’s REIT status, including any payments on any class of the Company’s capital stock that is required to be made prior to the payment of a dividend or distribution on the Company’s common stock and the Company’s existing payment obligations to holders of the Class A equity interests in Outfront Canada			The terms of the Credit Agreement (and under certain circumstances, the agreements governing the AR Securitization Facilities) require that we maintain a Consolidated Net Secured Leverage Ratio, which is the ratio of (i) our consolidated secured debt (less up to $150.0 million of unrestricted cash) to (ii) our Consolidated EBITDA (as defined in the Credit Agreement) for the trailing four consecutive quarters, of no greater than 4.5 to 1.0.
Debt Covenant, Consolidated Net Secured Leverage Ratio					4.5
Consolidated Net Secured Leverage Ratio					1.0
Revolving credit facility \| Maximum
Debt Instrument [Line Items]
Debt Covenant, Restricted cash limit				$ 150.0	$ 150.0
Subsequent event \| 6.250% senior unsecured notes, due 2025 \| Maximum
Debt Instrument [Line Items]
Redeemable percentage of outstanding debt instrument								40.00%
Subsequent event \| 6.250% senior unsecured notes, due 2025 \| Minimum
Debt Instrument [Line Items]
Percentage Of Debt Instrument Outstanding								50.00%