Accounts Receivable and Contract Assets (Additional Information) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period that contracts in transit are outstanding	10 days
Threshold period for interest to bear on receivables	60 days
Allowance for doubtful accounts	$ 6.3	$ 7.3
Auto loan receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, 60 days or less past due, percent	95.00%
Receivables, 60 days or less past due, non-accrual status, percent	5.00%
Allowance for doubtful accounts	$ 13.9