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Income Tax Expense - Effective Income Tax Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:      
Statutory U.S. federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
U.S. state income taxes, net of federal benefit 4.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 6.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 14.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Federal benefit of R&D and AMT credits, net 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 9.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Foreign earnings at lower rates than U.S. federal rate (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 39.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Federal (benefit) U.S. permanent differences (3.20%)sgms_EffectiveIncomeTaxRateReconciliationFederalExpenseBenefitOfDomesticPermanentDifferences (8.80%)sgms_EffectiveIncomeTaxRateReconciliationFederalExpenseBenefitOfDomesticPermanentDifferences (116.10%)sgms_EffectiveIncomeTaxRateReconciliationFederalExpenseBenefitOfDomesticPermanentDifferences
Federal valuation allowance adjustments 13.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 47.70%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (72.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 52.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 82.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations (89.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Valuation allowance, change in amount $ 71.4us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 62.5us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Minimum      
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:      
Foreign statutory tax rate 0.00%sgms_EffectiveIncomeTaxRateReconciliationatForeignStatutoryIncomeTaxRatePercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum      
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:      
Foreign statutory tax rate 35.00%sgms_EffectiveIncomeTaxRateReconciliationatForeignStatutoryIncomeTaxRatePercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Bally Technologies Inc.      
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:      
Valuation allowance, change in amount $ 79.1us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_BusinessAcquisitionAxis
= sgms_BallyTechnologiesInc.Member