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Equity Investments - Northstar Illinois (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]          
Earnings (loss) from equity investments     $ 7.6us-gaap_IncomeLossFromEquityMethodInvestments $ (1.5)us-gaap_IncomeLossFromEquityMethodInvestments $ (28.1)us-gaap_IncomeLossFromEquityMethodInvestments
Asset impairment charge         3.1us-gaap_AssetImpairmentCharges
Northstar Lottery Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity interest (as a percent)     20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
   
Agreement term     10 years    
Cap percentage of lottery net income, annual incentive compensation payments     5.00%sgms_MaximumPercentageOfLotteryNetIncomeAsIncentiveCompensation
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
   
Downward adjustment to net income target   8.0sgms_EquityMethodInvestmentDownwardAdjustmentToNetIncomeTarget
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
     
Estimated shortfall payment, percentage   20.00%sgms_EstimatedShortfallPaymentPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
     
Investee estimated shortfall payment 19.7sgms_EquityMethodInvestmentInvesteeEstimatedShortfallPayment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
13.5sgms_EquityMethodInvestmentInvesteeEstimatedShortfallPayment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
     
Investee recorded liability estimated shortfall payment   1.2sgms_EquityMethodInvestmentInvesteeRecordedLiabilityEstimatedShortfallPayment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
3.1sgms_EquityMethodInvestmentInvesteeRecordedLiabilityEstimatedShortfallPayment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
   
Earnings (loss) from equity investments 17.4us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
  34.8us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
4.5us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
2.6us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
Revenue from the sale of instant tickets to equity method investment     24.5us-gaap_RevenueFromRelatedParties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
25.0us-gaap_RevenueFromRelatedParties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
24.6us-gaap_RevenueFromRelatedParties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
Accounts receivable from equity method investment     8.1us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember
   
Northstar Lottery Group, LLC | Earnings from equity investments          
Schedule of Equity Method Investments [Line Items]          
Asset impairment charge $ 19.7us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= sgms_EarningsfromEquityInvestmentsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_NorthstarLotteryGroupLLCMember