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Income Taxes (Narrative) (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax [Line Items]    
Effective tax rates (as a percent) 41.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations (21.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Minimum    
Income Tax [Line Items]    
Effective income tax rate on foreign earnings 0.00%sgms_EffectiveIncomeTaxRateReconciliationatForeignStatutoryIncomeTaxRatePercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum    
Income Tax [Line Items]    
Effective income tax rate on foreign earnings 35.00%sgms_EffectiveIncomeTaxRateReconciliationatForeignStatutoryIncomeTaxRatePercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember