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Acquisitions and Dispositions - 2013 Acquisitions Pro Forma Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]                              
Revenue from Consolidated Statements of Operations and Comprehensive Loss $ 565.8us-gaap_Revenues $ 415.6us-gaap_Revenues $ 416.9us-gaap_Revenues $ 388.1us-gaap_Revenues $ 401.9us-gaap_Revenues $ 234.4us-gaap_Revenues $ 235.0us-gaap_Revenues $ 219.6us-gaap_Revenues $ 246.8us-gaap_Revenues $ 224.6us-gaap_Revenues $ 226.0us-gaap_Revenues $ 231.2us-gaap_Revenues $ 1,786.4us-gaap_Revenues $ 1,090.9us-gaap_Revenues $ 928.6us-gaap_Revenues
Unaudited pro forma revenue                         2,945.9us-gaap_BusinessAcquisitionsProFormaRevenue 3,016.9us-gaap_BusinessAcquisitionsProFormaRevenue  
WMS Acquisition                              
Business Acquisition [Line Items]                              
Revenue from Consolidated Statements of Operations and Comprehensive Loss         144.7us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
                   
Revenue not reflected in Statements of Operations and Comprehensive Loss                         0sgms_BusinessCombinationProformaInformationRevenueOfAcquireeNotIncludedInConsolidatedStatementOfOperations
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
567.4sgms_BusinessCombinationProformaInformationRevenueOfAcquireeNotIncludedInConsolidatedStatementOfOperations
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
688.5sgms_BusinessCombinationProformaInformationRevenueOfAcquireeNotIncludedInConsolidatedStatementOfOperations
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Unaudited pro forma revenue                           $ 1,658.3us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
$ 1,617.1us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member