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Significant Accounting Policies and Consolidated Financial Statement Components Schedule of Allowance for uncollectible loans and fees receivable (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
Allowance for uncollectible loans and fees receivable:            
Balance at beginning of period $ (19.9) $ (15.6) $ (21.5) $ (20.0)    
Provision for loan losses (10.8) (6.0) (15.5) (9.1)    
Charge offs 8.1 5.7 15.9 14.1    
Recoveries (1.6) (0.4) (3.1) (1.3)    
Balance at end of period (24.2) (16.3) (24.2) (16.3)    
Loans and fees receivable:            
Balance at end of period individually evaluated for impairment (0.9)   (0.9)   $ (1.4)  
Balance at end of period collectively evaluated for impairment (23.3)   (23.3)   (20.1)  
Loans and fees receivable, gross 242.7 154.6 242.7 154.6 180.1 $ 141.6
Loans and fees receivable individually evaluated for impairment 1.1   1.1   1.7  
Loans and fees receivable collectively evaluated for impairment 241.6   241.6   178.4  
Credit Cards [Member]            
Allowance for uncollectible loans and fees receivable:            
Balance at beginning of period (1.3) (1.9) (1.2) (2.7)    
Provision for loan losses 0.4 (0.4) 0.6 (0.9)    
Charge offs 0.6 0.9 1.0 2.3    
Recoveries (0.8) (0.1) (1.5) (0.2)    
Balance at end of period (1.1) (1.5) (1.1) (1.5)    
Loans and fees receivable:            
Balance at end of period individually evaluated for impairment 0.0   0.0   0.0  
Balance at end of period collectively evaluated for impairment (1.1)   (1.1)   (1.2)  
Loans and fees receivable, gross 5.4   5.4   5.2  
Loans and fees receivable individually evaluated for impairment 0.0   0.0   0.0  
Loans and fees receivable collectively evaluated for impairment 5.4   5.4   5.2  
Automobile Loan [Member]            
Allowance for uncollectible loans and fees receivable:            
Balance at beginning of period (1.8) (1.2) (1.7) (1.2)    
Provision for loan losses (0.8) (0.4) (1.4) (0.6)    
Charge offs 0.9 0.4 1.7 0.9    
Recoveries (0.3) (0.1) (0.6) (0.4)    
Balance at end of period (2.0) (1.3) (2.0) (1.3)    
Loans and fees receivable:            
Balance at end of period individually evaluated for impairment (0.2)   (0.2)   (0.1)  
Balance at end of period collectively evaluated for impairment (1.8)   (1.8)   (1.6)  
Loans and fees receivable, gross 78.6   78.6   76.0  
Loans and fees receivable individually evaluated for impairment 0.3   0.3   0.2  
Loans and fees receivable collectively evaluated for impairment 78.3   78.3   75.8  
Other Unsecured Lending Products [Member]            
Allowance for uncollectible loans and fees receivable:            
Balance at beginning of period (16.8) (12.5) (18.6) (16.1)    
Provision for loan losses (10.4) (5.2) (14.7) (7.6)    
Charge offs 6.6 4.4 13.2 10.9    
Recoveries (0.5) (0.2) (1.0) (0.7)    
Balance at end of period (21.1) $ (13.5) (21.1) $ (13.5)    
Loans and fees receivable:            
Balance at end of period individually evaluated for impairment (0.7)   (0.7)   (1.3)  
Balance at end of period collectively evaluated for impairment (20.4)   (20.4)   (17.3)  
Loans and fees receivable, gross 158.7   158.7   98.9  
Loans and fees receivable individually evaluated for impairment 0.8   0.8   1.5  
Loans and fees receivable collectively evaluated for impairment $ 157.9   $ 157.9   $ 97.4