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Accounts Receivable, Notes Receivable, Allowance for Doubtful Accounts and Bad Debt - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Nov. 21, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and notes receivable, net $ 744.6us-gaap_NotesReceivableNet 577.3us-gaap_NotesReceivableNet  
Argentina      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and notes receivable, net 24.0us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_AR
   
Proceeds from collection of accounts and notes receivable, net 34.5us-gaap_ProceedsFromCollectionOfFinanceReceivables
/ us-gaap_StatementGeographicalAxis
= country_AR
   
Mexico      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts and notes receivable, net 25.7us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_MX
   
Proceeds from collection of accounts and notes receivable, net 18.7us-gaap_ProceedsFromCollectionOfFinanceReceivables
/ us-gaap_StatementGeographicalAxis
= country_MX
   
Bally Acquisition      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase in accounts and notes receivable, net $ 283.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= sgms_BallyAcquisitionMember
  $ 217.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= sgms_BallyAcquisitionMember
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable, imputed interest rate 4.00%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
5.25%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable, imputed interest rate 10.40%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
8.00%us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember