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Equity Investments - Sportech (Details)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Jan. 31, 2014
Sportech
USD ($)
Jan. 31, 2014
Sportech
GBP (£)
Dec. 31, 2014
Sportech
Schedule of Equity Method Investments [Line Items]            
Equity interest (as a percent)           20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_SportechPlcMember
Time lag allowed under Accounting Standards Codification (in days)           90 days
Sales proceeds       $ 44.9us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_SportechPlcMember
£ 27.8us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_SportechPlcMember
 
Gain on sale of equity interest $ 14.5us-gaap_GainLossOnSaleOfEquityInvestments $ 0us-gaap_GainLossOnSaleOfEquityInvestments $ 0us-gaap_GainLossOnSaleOfEquityInvestments $ 14.5us-gaap_GainLossOnSaleOfEquityInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_SportechPlcMember
£ 9.0us-gaap_GainLossOnSaleOfEquityInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_SportechPlcMember