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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, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Allowance for uncollectible loans and fees receivable:            
Allowance for uncollectible loans and fees receivable, beginning balance $ (10.1) $ (12.5) $ (11.2) $ (14.7)    
Provision for loan losses (6.7) (7.4) (10.0) (10.3)    
Charge offs 3.7 4.1 8.9 10.7    
Recoveries (0.5) (1.2) (1.3) (2.7)    
Allowance for uncollectible loans and fees receivable, ending balance (13.6) (17.0) (13.6) (17.0)    
Balance at end of period individually evaluated for impairment 0 0 0 0    
Balance at end of period collectively evaluated for impairment (13.6) (17.0) (13.6) (17.0)    
Loans and fees receivable:            
Loans and fees receivable, gross 99.5 112.5 99.5 112.5 89.1 119.3
Loans and fees receivable individually evaluated for impairment 0 0.1 0 0.1    
Loans and fees receivable collectively evaluated for impairment 99.5 112.4 99.5 112.4    
Credit Cards [Member]
            
Allowance for uncollectible loans and fees receivable:            
Allowance for uncollectible loans and fees receivable, beginning balance (4.0) (4.5) (4.6) (4.0)    
Provision for loan losses (3.7) (7.1) (5.9) (8.9)    
Charge offs 1.5 1.4 4.3 3.0    
Recoveries (0.1) (0.3) (0.1) (0.6)    
Allowance for uncollectible loans and fees receivable, ending balance (6.3) (10.5) (6.3) (10.5)    
Balance at end of period individually evaluated for impairment 0 0 0 0    
Balance at end of period collectively evaluated for impairment (6.3) (10.5) (6.3) (10.5)    
Loans and fees receivable:            
Loans and fees receivable, gross 13.2 27.9 13.2 27.9    
Loans and fees receivable individually evaluated for impairment 0 0 0 0    
Loans and fees receivable collectively evaluated for impairment 13.2 27.9 13.2 27.9    
Auto Finance [Member]
            
Allowance for uncollectible loans and fees receivable:            
Allowance for uncollectible loans and fees receivable, beginning balance (2.6) (6.1) (3.1) (8.4)    
Provision for loan losses 0.5 0.7 0.7 1.3    
Charge offs 1.2 1.8 2.3 4.7    
Recoveries (0.3) (0.9) (1.1) (2.1)    
Allowance for uncollectible loans and fees receivable, ending balance (1.2) (4.5) (1.2) (4.5)    
Balance at end of period individually evaluated for impairment 0 0 0 0    
Balance at end of period collectively evaluated for impairment (1.2) (4.5) (1.2) (4.5)    
Loans and fees receivable:            
Loans and fees receivable, gross 60.7 73.4 60.7 73.4    
Loans and fees receivable individually evaluated for impairment 0 0.1 0 0.1    
Loans and fees receivable collectively evaluated for impairment 60.7 73.3 60.7 73.3    
Other Unsecured Lending Products [Member]
            
Allowance for uncollectible loans and fees receivable:            
Allowance for uncollectible loans and fees receivable, beginning balance (3.5) (1.9) (3.5) (2.3)    
Provision for loan losses (3.5) (1.0) (4.8) (2.7)    
Charge offs 1.0 0.9 2.3 3.0    
Recoveries (0.1) 0 (0.1) 0    
Allowance for uncollectible loans and fees receivable, ending balance (6.1) (2.0) (6.1) (2.0)    
Balance at end of period individually evaluated for impairment 0 0 0 0    
Balance at end of period collectively evaluated for impairment (6.1) (2.0) (6.1) (2.0)    
Loans and fees receivable:            
Loans and fees receivable, gross 25.6 11.2 25.6 11.2    
Loans and fees receivable individually evaluated for impairment 0 0 0 0    
Loans and fees receivable collectively evaluated for impairment 25.6 11.2 25.6 11.2    
Segment, Discontinued Operations [Member]
            
Allowance for uncollectible loans and fees receivable:            
Provision for loan losses   $ 1.4   $ 1.8