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Acquisitions and Dispositions - 2013 Acquisitions Purchase Price Allocation (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 18, 2013
Business Acquisition [Line Items]        
Goodwill $ 4,108.3us-gaap_Goodwill $ 1,183.1us-gaap_Goodwill $ 801.4us-gaap_Goodwill  
Total liabilities (6.6)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities (26.1)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities    
WMS Acquisition        
Business Acquisition [Line Items]        
Current assets       503.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Long-term notes receivable       76.2sgms_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNoncurrentAssetsNotesReceivable
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Property, plant and equipment, net       465.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Goodwill       381.8us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Intangible assets       325.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Intellectual property       201.2sgms_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntellectualProperty
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Other long-term assets       7.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Total assets       1,961.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Current liabilities       (158.9)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Deferred income taxes       (166.6)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Other long-term liabilities       (150.3)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Total liabilities       (475.8)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member
Total equity purchase price       $ 1,485.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= sgms_WMSIndustriesInc.Member