Summary of Non-Accrual Loans and Finance Leases with Specific Reserve and No Specific Reserve (Details) - Financial Services - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Amortized cost basis with Loans/leases specific reserve	$ 46.0	$ 85.0
Amortized cost basis with Loans/leases no specific reserve	5.8	2.9
Total	51.8	87.9
Dealer | Retail
Financing Receivable, Impaired [Line Items]
Amortized cost basis with Loans/leases no specific reserve	1.1	1.2
Total	1.1	1.2
Customer Retail | Fleet
Financing Receivable, Impaired [Line Items]
Amortized cost basis with Loans/leases specific reserve	40.3	76.9
Amortized cost basis with Loans/leases no specific reserve	4.7	1.7
Total	45.0	78.6
Customer Retail | Owner/Operator
Financing Receivable, Impaired [Line Items]
Amortized cost basis with Loans/leases specific reserve	5.7	8.1
Total	$ 5.7	$ 8.1