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Retirement Benefits Net Periodic Benefit Cost Not Yet Recognized (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]    
Net actuarial loss $ (10.2)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax $ (19.3)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
Deferred income taxes 4.3out_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeDeferredTax 7.6out_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeDeferredTax
Net amount recognized in accumulated other comprehensive loss $ (5.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (11.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax