Summary of Non-Accrual Loans and Finance Leases with Specific Reserve and No Specific Reserve (Details) - Financial Services - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	$ 275.2	$ 74.1
Amortized cost basis with no specific reserve	9.2	23.6
Total	284.4	97.7
Dealer | Wholesale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with no specific reserve	0.4
Total	0.4
Customer Retail | Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	269.0	69.8
Amortized cost basis with no specific reserve	7.6	22.8
Total	276.6	92.6
Customer Retail | Owner/Operator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	6.2	4.3
Amortized cost basis with no specific reserve	1.2	0.8
Total	$ 7.4	$ 5.1