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Loans Receivable (Schedule of Consumer Loans Performance) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable $ 6,873.6 $ 6,617.9 $ 6,225.2 $ 5,780.1 $ 5,498.1 $ 5,049.0
Allowance for credit losses (489.6) (474.2) (461.9) (435.7) (448.4) (429.4)
Loans receivable, net 6,384.0   5,763.3      
Loan Pool Performance Meets Or Exceeds Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 3,334.6   2,747.2      
Loans receivable, net 3,334.6   2,747.2      
Loan Pool Performance Less Than Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 3,539.0   3,478.0      
Allowance for credit losses (489.6)   (461.9)      
Loans receivable, net 3,049.4   3,016.1      
Dealer Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 4,466.0 4,347.5 4,141.0 3,918.4 3,773.5 3,518.1
Allowance for credit losses (394.0) (383.1) (378.1) (365.9) (379.3) (366.0)
Loans receivable, net 4,072.0   3,762.9      
Dealer Loans [Member] | Loan Pool Performance Meets Or Exceeds Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 1,563.3   1,355.1      
Loans receivable, net 1,563.3   1,355.1      
Dealer Loans [Member] | Loan Pool Performance Less Than Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 2,902.7   2,785.9      
Allowance for credit losses (394.0)   (378.1)      
Loans receivable, net 2,508.7   2,407.8      
Purchased Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 2,407.6 2,270.4 2,084.2 1,861.7 1,724.6 1,530.9
Allowance for credit losses (95.6) $ (91.1) (83.8) $ (69.8) $ (69.1) $ (63.4)
Loans receivable, net 2,312.0   2,000.4      
Purchased Loans [Member] | Loan Pool Performance Meets Or Exceeds Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 1,771.3   1,392.1      
Loans receivable, net 1,771.3   1,392.1      
Purchased Loans [Member] | Loan Pool Performance Less Than Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 636.3   692.1      
Allowance for credit losses (95.6)   (83.8)      
Loans receivable, net $ 540.7   $ 608.3