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INVESTMENTS Equity in (Income) Loss of Equity Method Investments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Dec. 28, 2014
Schedule of Equity Method Investments [Line Items]      
Investments $ 446.7us-gaap_EquityMethodInvestments   $ 498.0us-gaap_EquityMethodInvestments
(Income) loss from equity method investments (4.0)us-gaap_IncomeLossFromEquityMethodInvestments (15.1)us-gaap_IncomeLossFromEquityMethodInvestments  
Campofrio Food Group      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage 37.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_CampofrioFoodGroupMember
   
Investments 300.6us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_CampofrioFoodGroupMember
  330.0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_CampofrioFoodGroupMember
(Income) loss from equity method investments 3.1us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_CampofrioFoodGroupMember
(3.1)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_CampofrioFoodGroupMember
 
Mexican Joint Ventures      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_MexicanJointVenturesMember
   
Investments 121.5us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_MexicanJointVenturesMember
  142.8us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_MexicanJointVenturesMember
(Income) loss from equity method investments (7.2)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_MexicanJointVenturesMember
(11.8)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_MexicanJointVenturesMember
 
Other Equity Method Investments      
Schedule of Equity Method Investments [Line Items]      
Investments 24.6us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_OtherEquityMethodInvestmentsMember
  25.2us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_OtherEquityMethodInvestmentsMember
(Income) loss from equity method investments $ 0.1us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_OtherEquityMethodInvestmentsMember
$ (0.2)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sfd_OtherEquityMethodInvestmentsMember