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Pension and Other Post-Retirement Plans - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Sep. 30, 2013
Dec. 31, 2013
Defined benefit pension plans      
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions in the next fiscal year $ 2.1us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Accumulated benefit obligation 124.9us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
  112.4us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Underfunded status of plan 20.2us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
  10.0us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
U.K. Plan      
Defined Benefit Plan Disclosure [Line Items]      
Decrease in benefit obligation due to plan amendment   $ 5.8us-gaap_DefinedBenefitPlanPlanAmendments
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
 
Maximum increase in pensionable earnings   2.00%sgms_DefinedBenefitPlanPlanAmendmantsMaximumAnnualIncreaseForPensionableEarningsWhilePlanIsNot100PercentFunded
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
 
Funded percentage (less than 100%)   100.00%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
 
Global return fund | U.K. Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 35.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= sgms_GlobalReturnFundMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
   
Long lease property | U.K. Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= sgms_LongLeasePropertyMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
   
Corporate bonds | U.K. Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
   
Corporate bonds | Canadian Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_CanadianPensionPlansOfUsEntityDefinedBenefitMember
   
Real estate | U.K. Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_RealEstateInvestmentMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
   
U.K | Equity securities | U.K. Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
/ us-gaap_StatementGeographicalAxis
= country_GB
   
Canada | Equity securities | Canadian Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_CanadianPensionPlansOfUsEntityDefinedBenefitMember
/ us-gaap_StatementGeographicalAxis
= country_CA
   
Other foreign countries | Equity securities | U.K. Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_UnitedKingdomPensionPlansOfUsEntityDefinedBenefitMember
/ us-gaap_StatementGeographicalAxis
= sgms_OtherForeignCountriesMember
   
Other foreign countries | Equity securities | Canadian Plan      
Target allocations of plan assets      
Target allocation in debt securities (as a percent) 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sgms_CanadianPensionPlansOfUsEntityDefinedBenefitMember
/ us-gaap_StatementGeographicalAxis
= sgms_OtherForeignCountriesMember