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Equity Investments - ITL (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]      
Earnings (loss) from equity investments $ (7.6)us-gaap_IncomeLossFromEquityMethodInvestments $ 1.5us-gaap_IncomeLossFromEquityMethodInvestments $ 28.1us-gaap_IncomeLossFromEquityMethodInvestments
Distributed earnings from equity investments 28.5us-gaap_EquityMethodInvestmentDividendsOrDistributions 29.5us-gaap_EquityMethodInvestmentDividendsOrDistributions 38.1us-gaap_EquityMethodInvestmentDividendsOrDistributions
International Terminal Leasing      
Schedule of Equity Method Investments [Line Items]      
Earnings (loss) from equity investments (1.8)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember
(16.5)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember
(3.8)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember
Distributed earnings from equity investments   2.4us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember
 
Additions to equity method investments 17.4us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember
2.4us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember
3.8us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember
Additional contributions $ 40.3us-gaap_IncreaseInRestrictedCash
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sgms_InternationalTerminalLeasingMember