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Retirement Benefits - Narrative (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]        
Accumulated Benefit Obligation   $ 41.6us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation $ 46.5us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Estimated amortization from AOCI of net actuarial losses   0.4us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss    
Expected Future Benefit Payments, Next Twelve Months   4.1us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear    
Multiemployer Plan, Period Contributions   1.6us-gaap_MultiemployerPlanPeriodContributions 1.7us-gaap_MultiemployerPlanPeriodContributions 1.8us-gaap_MultiemployerPlanPeriodContributions
Defined Contribution Plan, employer contributions   3.7us-gaap_DefinedContributionPlanCostRecognized 3.4us-gaap_DefinedContributionPlanCostRecognized 3.2us-gaap_DefinedContributionPlanCostRecognized
Pension Contributions 1.9us-gaap_PensionContributions      
Estimated Future Employer Contributions in Current Fiscal Year $ 2.0us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear      
Fixed Income Securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan Asset Allocations   40.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeSecuritiesMember
   
Equity Securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan Asset Allocations   54.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
   
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Pension Plan's interest in Master Trust   1.00%out_PensionPlansinterestinMasterTrust
/ us-gaap_RangeAxis
= us-gaap_MaximumMember