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Subsequent Events (Narrative) (Details) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
May 31, 2015
Subsequent Events [Line Items]  
Foreign Earnings Repatriated $ 600.0us-gaap_ForeignEarningsRepatriated
Forecast [Member] | Minimum Member
  
Subsequent Events [Line Items]  
Discrete Tax Charge Related to Foreign Earnings Repatriated 60.0gis_DiscreteTaxChargeRelatedToForeignEarningsRepatriated
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Forecast [Member] | Maximum [Member]
  
Subsequent Events [Line Items]  
Discrete Tax Charge Related to Foreign Earnings Repatriated $ 80.0gis_DiscreteTaxChargeRelatedToForeignEarningsRepatriated
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember