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Loans Receivable (Schedule of Consumer Loans Performance) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable $ 7,072.8 $ 6,873.6 $ 6,225.2 $ 6,005.2 $ 5,780.1 $ 5,049.0
Allowance for credit losses (509.1) (489.6) (461.9) (447.6) (435.7) (429.4)
Loans receivable, net 6,563.7   5,763.3      
Loan Pool Performance Meets Or Exceeds Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 3,516.4   2,747.2      
Loans receivable, net 3,516.4   2,747.2      
Loan Pool Performance Less Than Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 3,556.4   3,478.0      
Allowance for credit losses (509.1)   (461.9)      
Loans receivable, net 3,047.3   3,016.1      
Dealer Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 4,559.3 4,466.0 4,141.0 4,030.2 3,918.4 3,518.1
Allowance for credit losses (409.3) (394.0) (378.1) (373.0) (365.9) (366.0)
Loans receivable, net 4,150.0   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 1,585.3   1,355.1      
Loans receivable, net 1,585.3   1,355.1      
Dealer Loans [Member] | Loan Pool Performance Less Than Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 2,974.0   2,785.9      
Allowance for credit losses (409.3)   (378.1)      
Loans receivable, net 2,564.7   2,407.8      
Purchased Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 2,513.5 2,407.6 2,084.2 1,975.0 1,861.7 1,530.9
Allowance for credit losses (99.8) $ (95.6) (83.8) $ (74.6) $ (69.8) $ (63.4)
Loans receivable, net 2,413.7   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 1,931.1   1,392.1      
Loans receivable, net 1,931.1   1,392.1      
Purchased Loans [Member] | Loan Pool Performance Less Than Initial Estimates [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 582.4   692.1      
Allowance for credit losses (99.8)   (83.8)      
Loans receivable, net $ 482.6   $ 608.3