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Significant Accounting Policies and Consolidated Financial Statement Components Schedule of Aging of delinquent loans and fees receivable, gross (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable $ 24.6   $ 24.6   $ 25.6  
Current loans and fees receivable, gross 218.1   218.1   154.5  
Loans and fees receivable, gross 242.7 $ 154.6 242.7 $ 154.6 180.1 $ 141.6
Balance of loans 90 or more days past due and still accruing interest and fees $ 1.0   $ 1.0   1.5  
Effective Income Tax Rate, Continuing Operations (70.60%) (50.80%) (15.10%) (19.60%)    
Weighted Average Remaining Accretion Period of Deferred Revenue     11 months 10 months    
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority $ 7.3   $ 7.3      
Unrecognized Tax Benefits, Income Tax Penalties Accrued 3.1   3.1      
Unrecognized Tax Benefits, Income Tax Penalties Expense (0.2) $ (0.5) (0.4) $ (0.7)    
Credit Cards [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 0.7   0.7   0.7  
Current loans and fees receivable, gross 4.7   4.7   4.5  
Loans and fees receivable, gross 5.4   5.4   5.2  
Balance of loans 90 or more days past due and still accruing interest and fees 0.0   0.0   0.0  
Automobile Loan [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 10.0   10.0   10.9  
Current loans and fees receivable, gross 68.6   68.6   65.1  
Loans and fees receivable, gross 78.6   78.6   76.0  
Balance of loans 90 or more days past due and still accruing interest and fees 1.0   1.0   1.5  
Other Unsecured Lending Products [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 13.9   13.9   14.0  
Current loans and fees receivable, gross 144.8   144.8   84.9  
Loans and fees receivable, gross 158.7   158.7   98.9  
Balance of loans 90 or more days past due and still accruing interest and fees 0.0   0.0   0.0  
Financing Receivables, 30 to 59 Days Past Due [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 11.9   11.9   11.5  
Financing Receivables, 30 to 59 Days Past Due [Member] | Credit Cards [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 0.1   0.1   0.2  
Financing Receivables, 30 to 59 Days Past Due [Member] | Automobile Loan [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 6.8   6.8   6.9  
Financing Receivables, 30 to 59 Days Past Due [Member] | Other Unsecured Lending Products [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 5.0   5.0   4.4  
Financing Receivables, 60 to 89 Days Past Due [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 5.3   5.3   5.4  
Financing Receivables, 60 to 89 Days Past Due [Member] | Credit Cards [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 0.1   0.1   0.1  
Financing Receivables, 60 to 89 Days Past Due [Member] | Automobile Loan [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 1.9   1.9   2.2  
Financing Receivables, 60 to 89 Days Past Due [Member] | Other Unsecured Lending Products [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 3.3   3.3   3.1  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 7.4   7.4   8.7  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit Cards [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 0.5   0.5   0.4  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Automobile Loan [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable 1.3   1.3   1.8  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other Unsecured Lending Products [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Delinquent loans and fees receivable $ 5.6   $ 5.6   $ 6.5