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Deferred Acquisition Costs ("DAC"), Value Of Business Acquired ("VOBA") And Other Intangible Assets (Amount For DAC, VOBA Balances And Percentage To The Expected Gross Profit) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Acquisition Costs Value Of Business Acquired And Other Intangible Assets Disclosures [Abstract]    
DAC $ 82.4sfg_DeferredAcquisitionCostsAmortizedInProportionToExpectedGrossProfits $ 80.1sfg_DeferredAcquisitionCostsAmortizedInProportionToExpectedGrossProfits
VOBA $ 3.7sfg_ValueOfBusinessAcquiredAmortizedInProportionToExpectedGrossProfits $ 4.3sfg_ValueOfBusinessAcquiredAmortizedInProportionToExpectedGrossProfits
DAC, percent 24.50%sfg_DeferredAcquisitionCostsPercentageAmortizedInProportionToExpectedGrossProfits 25.10%sfg_DeferredAcquisitionCostsPercentageAmortizedInProportionToExpectedGrossProfits
VOBA, percent 20.80%sfg_ValueOfBusinessAcquiredPercentageAmortizedInProportionToExpectedGrossProfits 21.40%sfg_ValueOfBusinessAcquiredPercentageAmortizedInProportionToExpectedGrossProfits