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Acquisitions and Dispositions - 2013 Acquisitions Reconciliation (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]                              
Net loss from continuing operations $ (47.1)us-gaap_IncomeLossFromContinuingOperations $ (69.8)us-gaap_IncomeLossFromContinuingOperations $ (72.4)us-gaap_IncomeLossFromContinuingOperations $ (45.0)us-gaap_IncomeLossFromContinuingOperations $ (0.5)us-gaap_IncomeLossFromContinuingOperations $ (0.4)us-gaap_IncomeLossFromContinuingOperations $ (12.4)us-gaap_IncomeLossFromContinuingOperations $ (12.3)us-gaap_IncomeLossFromContinuingOperations $ (12.4)us-gaap_IncomeLossFromContinuingOperations $ (24.5)us-gaap_IncomeLossFromContinuingOperations $ (10.9)us-gaap_IncomeLossFromContinuingOperations $ 3.9us-gaap_IncomeLossFromContinuingOperations $ (234.3)us-gaap_IncomeLossFromContinuingOperations $ (25.6)us-gaap_IncomeLossFromContinuingOperations $ (43.9)us-gaap_IncomeLossFromContinuingOperations
Unaudited pro forma net loss from continuing operations                         (429.7)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax (409.4)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax  
WMS Acquisition                              
Business Acquisition [Line Items]                              
Add: net loss not reflected in Consolidated Statement of Operations plus pro forma adjustments                         0sgms_BusinessCombinationProformaInformationEarningsOrLossOfAcquireeNotIncludedInConsolidatedStatementOfOperations
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
(34.7)sgms_BusinessCombinationProformaInformationEarningsOrLossOfAcquireeNotIncludedInConsolidatedStatementOfOperations
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
(50.4)sgms_BusinessCombinationProformaInformationEarningsOrLossOfAcquireeNotIncludedInConsolidatedStatementOfOperations
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Unaudited pro forma net loss from continuing operations                           $ (60.3)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
$ (94.3)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member