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Employee Benefit Plans - Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]  
Employer matching contribution 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Employer matching contribution on dollar for participant contributions $ 0.35sgms_DefinedContributionPlanEmployerMatchingContributiononDollarforParticipantContributions
Maximum percentage of participant contribution eligible for employer contribution match 6.00%sgms_DefinedContributionPlanMaximumPercentageOfParticipantContributionEligibleForEmployerContributionMatch
United Kingdom Pension Plans of US Entity Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
Period of employees average compensation, preceding retirement considered for computation of retirement benefits 2 years
Bally Technologies Inc.  
Defined Benefit Plan Disclosure [Line Items]  
Employer matching contribution 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_BusinessAcquisitionAxis
= sgms_BallyTechnologiesInc.Member
Maximum annual contributions per employee (as percent) 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_BusinessAcquisitionAxis
= sgms_BallyTechnologiesInc.Member