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Finance Receivables - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Approved but unfunded retail loans $ 160.4 $ 154.8
Threshold period past due to be charged-off 120 days  
Wholesale    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unused lines of credit, wholesale $ 1,140.0 $ 1,210.0
Financing receivable on non-accrual status $ 5.0  
Finance receivables | Geographic Concentration Risk | Texas    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration risk (as a percent) 11.00% 11.00%
Greater than 90 Days Past Due | Wholesale    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable on non-accrual status $ 2.6