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Condensed Consolidating Financial Information - Condensed Consolidating Cash Flow Statement (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flow provided by (used for) operating activities $ 5.8us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 7.8us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Capital expenditures (13.1)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (15.7)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisitions 9.9us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net proceeds from dispositions 0.7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0.5us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash flow provided by (used for) investing activities (22.3)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (15.2)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Proceeds from long-term debt borrowings - term loan and senior notes 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,598.0us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from long-term debt borrowings - new senior notes 103.8us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt 0us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
Proceeds from borrowings under revolving credit facility 105.0us-gaap_ProceedsFromLongTermLinesOfCredit 0us-gaap_ProceedsFromLongTermLinesOfCredit
Repayments of borrowings under revolving credit facility (105.0)us-gaap_RepaymentsOfLongTermLinesOfCredit 0us-gaap_RepaymentsOfLongTermLinesOfCredit
Deferred financing costs (2.2)us-gaap_PaymentsOfFinancingCosts (24.3)us-gaap_PaymentsOfFinancingCosts
Proceeds from stock option exercises 2.0us-gaap_ProceedsFromStockOptionsExercised 0us-gaap_ProceedsFromStockOptionsExercised
Taxes withheld for stock-based compensation (3.0)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Distribution of net debt proceeds to CBS 0us-gaap_PaymentsOfCapitalDistribution (1,523.8)us-gaap_PaymentsOfCapitalDistribution
Net cash contribution from CBS 0out_Netcashcontributiondistributiontoparent 42.2out_Netcashcontributiondistributiontoparent
Dividends (54.9)us-gaap_PaymentsOfOrdinaryDividends 0us-gaap_PaymentsOfOrdinaryDividends
Intercompany 0out_IncreaseDecreaseInIntercompanyPayables 0out_IncreaseDecreaseInIntercompanyPayables
Other (0.4)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (0.1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash flow provided by (used for) financing activities 45.3us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 92.0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents (1.3)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (0.5)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase in cash and cash equivalents 27.5us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 84.1us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 28.5us-gaap_CashAndCashEquivalentsAtCarryingValue 29.8us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 56.0us-gaap_CashAndCashEquivalentsAtCarryingValue 113.9us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flow provided by (used for) operating activities (0.5)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Capital expenditures 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Acquisitions 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
 
Net proceeds from dispositions 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Net cash flow provided by (used for) investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Proceeds from long-term debt borrowings - term loan and senior notes   0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Proceeds from long-term debt borrowings - new senior notes 0us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
 
Proceeds from borrowings under revolving credit facility 0us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
 
Repayments of borrowings under revolving credit facility 0us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
 
Deferred financing costs 0us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Proceeds from stock option exercises 2.0us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
 
Taxes withheld for stock-based compensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
 
Distribution of net debt proceeds to CBS   0us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Net cash contribution from CBS   2.4out_Netcashcontributiondistributiontoparent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Dividends (54.9)us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
 
Intercompany 53.4out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
(2.4)out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Net cash flow provided by (used for) financing activities 0.5us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Net increase in cash and cash equivalents 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ParentCompanyMember
Subsidiary Issuer    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flow provided by (used for) operating activities (17.1)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Capital expenditures 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Acquisitions 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
 
Net proceeds from dispositions 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Net cash flow provided by (used for) investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Proceeds from long-term debt borrowings - term loan and senior notes   1,598.0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Proceeds from long-term debt borrowings - new senior notes 103.8us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
 
Proceeds from borrowings under revolving credit facility 105.0us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
 
Repayments of borrowings under revolving credit facility (105.0)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
 
Deferred financing costs (2.2)us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
(24.3)us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Proceeds from stock option exercises 0us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
 
Taxes withheld for stock-based compensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
 
Distribution of net debt proceeds to CBS   (1,523.8)us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Net cash contribution from CBS   0out_Netcashcontributiondistributiontoparent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Dividends 0us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
 
Intercompany (75.6)out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
20.5out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Net cash flow provided by (used for) financing activities 26.0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
70.4us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Net increase in cash and cash equivalents 8.9us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
70.4us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Cash and cash equivalents at beginning of period 11.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Cash and cash equivalents at end of period 20.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
70.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_SubsidiaryIssuerMember
Guarantor Subsidiaries    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flow provided by (used for) operating activities 9.1us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
5.8us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Capital expenditures (12.1)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
(12.2)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Acquisitions 9.9us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
 
Net proceeds from dispositions 0.7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
0.3us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash flow provided by (used for) investing activities (21.3)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
(11.9)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from long-term debt borrowings - term loan and senior notes   0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from long-term debt borrowings - new senior notes 0us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
 
Proceeds from borrowings under revolving credit facility 0us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
 
Repayments of borrowings under revolving credit facility 0us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
 
Deferred financing costs 0us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from stock option exercises 0us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
 
Taxes withheld for stock-based compensation (3.0)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
 
Distribution of net debt proceeds to CBS   0us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash contribution from CBS   39.8out_Netcashcontributiondistributiontoparent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Dividends 0us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
 
Intercompany 21.9out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
(11.7)out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Other (0.4)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
(0.1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash flow provided by (used for) financing activities 18.5us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
28.0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Net increase in cash and cash equivalents 6.3us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
21.9us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents at beginning of period 8.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
2.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents at end of period 15.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
24.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flow provided by (used for) operating activities 14.3us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
2.0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Capital expenditures (1.0)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
(3.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Acquisitions 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net proceeds from dispositions 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
0.2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash flow provided by (used for) investing activities (1.0)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
(3.3)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from long-term debt borrowings - term loan and senior notes   0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from long-term debt borrowings - new senior notes 0us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Proceeds from borrowings under revolving credit facility 0us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Repayments of borrowings under revolving credit facility 0us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Deferred financing costs 0us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from stock option exercises 0us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Taxes withheld for stock-based compensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Distribution of net debt proceeds to CBS   0us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash contribution from CBS   0out_Netcashcontributiondistributiontoparent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Dividends 0us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Intercompany 0.3out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
(6.4)out_IncreaseDecreaseInIntercompanyPayables
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash flow provided by (used for) financing activities 0.3us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
(6.4)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
Effect of exchange rate changes on cash and cash equivalents (1.3)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_NonGuarantorSubsidiariesMember
(0.5)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
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Net increase in cash and cash equivalents 12.3us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
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(8.2)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
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Cash and cash equivalents at beginning of period 8.2us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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27.7us-gaap_CashAndCashEquivalentsAtCarryingValue
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Cash and cash equivalents at end of period 20.5us-gaap_CashAndCashEquivalentsAtCarryingValue
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19.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flow provided by (used for) operating activities 0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
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Capital expenditures 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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Acquisitions 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
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Net proceeds from dispositions 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
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0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
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Net cash flow provided by (used for) investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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Proceeds from long-term debt borrowings - term loan and senior notes   0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
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Proceeds from long-term debt borrowings - new senior notes 0us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
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Proceeds from borrowings under revolving credit facility 0us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
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Repayments of borrowings under revolving credit facility 0us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
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Deferred financing costs 0us-gaap_PaymentsOfFinancingCosts
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0us-gaap_PaymentsOfFinancingCosts
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Proceeds from stock option exercises 0us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_ConsolidationItemsAxis
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Taxes withheld for stock-based compensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_ConsolidationItemsAxis
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Distribution of net debt proceeds to CBS   0us-gaap_PaymentsOfCapitalDistribution
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Net cash contribution from CBS   0out_Netcashcontributiondistributiontoparent
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Dividends 0us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_ConsolidationItemsAxis
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Intercompany 0out_IncreaseDecreaseInIntercompanyPayables
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0out_IncreaseDecreaseInIntercompanyPayables
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Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
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0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
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Net cash flow provided by (used for) financing activities 0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
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0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_ConsolidationItemsAxis
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Net increase in cash and cash equivalents 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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Cash and cash equivalents at beginning of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
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0us-gaap_CashAndCashEquivalentsAtCarryingValue
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Cash and cash equivalents at end of period $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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$ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
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