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Accounts Receivable and Contract Assets (Additional Information) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
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 | $ 14.3 | $ 5.9
Auto loan receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Receivables, 60 days or less past due, percent | 98.00% |
Receivables, 60 days or less past due, non-accrual status, percent | 2.00% |
Allowance for doubtful accounts | $ 17.2 |

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