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Restructuring Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Pre-tax employee termination and restructuring costs $ 8.2us-gaap_RestructuringCharges $ 5.6us-gaap_RestructuringCharges
Gaming    
Restructuring Cost and Reserve [Line Items]    
Number of immaterial business lines with exit costs 2sgms_NumberofImmaterialBusinessLineswithExitCosts
/ us-gaap_StatementBusinessSegmentsAxis
= sgms_GamingGroupMember