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Retirement Benefit Plans (Expected Future Payments) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]      
Cost of savings, thrift and profit-sharing plans $ 8.7us-gaap_DefinedContributionPlanCostRecognized $ 10.5us-gaap_DefinedContributionPlanCostRecognized $ 10.9us-gaap_DefinedContributionPlanCostRecognized
Estimated Future Benefit Payments [Abstract]      
2015, Benefit plans 20.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths    
2016, Benefit plans 14.4us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo    
2017, Benefit plans 32.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree    
2018, Benefit plans 14.6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour    
2019, Benefit plans 18.5us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive    
2020-2024, Benefit plans 78.8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter    
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions in next fiscal year 12.8us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Estimated Future Benefit Payments [Abstract]      
2015, Benefit plans 17.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
2016, Benefit plans 12.4us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
2017, Benefit plans 30.4us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
2018, Benefit plans 12.8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
2019, Benefit plans 16.8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
2020-2024, Benefit plans 71.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Postretirement Benefits [Member]      
Estimated Future Benefit Payments [Abstract]      
2015, Benefit plans 2.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
2016, Benefit plans 2.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
2017, Benefit plans 1.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
2018, Benefit plans 1.8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
2019, Benefit plans 1.7us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
2020-2024, Benefit plans 6.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
   
U.S. Postretirement Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions in next fiscal year $ 2.1us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember