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Stock-Based Compensation - Schedule of Allocation of Share-based Compensation Costs by Plan (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense, before income taxes $ 3.6us-gaap_AllocatedShareBasedCompensationExpense $ 1.8us-gaap_AllocatedShareBasedCompensationExpense
Tax benefit (0.3)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (0.8)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based compensation expense, net of tax 3.3us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 1.0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense, before income taxes 3.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
1.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense, before income taxes $ 0.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 0.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember