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Severance, Lease Terminations And Transition Costs (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Severance, Lease Terminations, And Transition Costs [Line Items]  
Operating expenses $ 442.6us-gaap_OperatingExpenses
Other Project Related Costs [Member]  
Severance, Lease Terminations, And Transition Costs [Line Items]  
Operating expenses $ 2.3us-gaap_OperatingExpenses
/ us-gaap_RestructuringCostAndReserveAxis
= sfg_OtherProjectRelatedCostsMember