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Stock-Based Compensation - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Nov. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Legacy Bally Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based awards assumed in acquisition 1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= sgms_LegacyBallyPlanMember
   
Shares assumed under Bally Legacy Plan 3,400,000sgms_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAssumedInBusinessAcquisition
/ us-gaap_PlanNameAxis
= sgms_LegacyBallyPlanMember
   
Share-based compensation arrangement by share-based payment award, number of shares available for grant, conversion ratio   1.75sgms_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAvailableforGrantConversionRatio
/ us-gaap_PlanNameAxis
= sgms_LegacyBallyPlanMember
 
2003 Incentive Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized   7,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sgms_TwoThousandThreeIncentiveCompensationPlanMember
 
ESPP Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance   100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sgms_ESPPPlanMember
 
Employee stock option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period   10 years  
Grants in period, weighted average grant date fair value   $ 6.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 8.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Share-based compensation expense   $ 0.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 0.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Tax benefit from compensation expense   0.1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Compensation cost not yet recognized   3.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Compensation cost not yet recognized, period for recognition   2 years  
Employee stock option | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   4 years  
Employee stock option | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   5 years  
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense   4.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
4.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Tax benefit from compensation expense   1.7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1.7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Compensation cost not yet recognized   $ 49.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Compensation cost not yet recognized, period for recognition   2 years  
Restricted stock units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   4 years  
Restricted stock units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   5 years  
Employee stock | Class A common stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized   1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Maximum employee subscription rate   15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Award offering period   6 months  
Discount from market price   15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember