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Finance Receivables and Obligations Collateralized by Finance Receivables (Details) $ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 CAD ($)	Mar. 31, 2025 CAD ($)	Dec. 31, 2024 USD ($)
Finance Receivables and Obligations Collateralized by Finance Receivables
Cost capitalized in connection with US/Canada RPA			$ 0.4	$ 2.2
Principal amount of receivables	$ 2,347.4		2,347.4				$ 2,314.0
Principal amount of receivables delinquent	7.7		7.7				18.0
Net credit losses	10.3	$ 14.0	18.6	29.5
Accrued interest and fees	27.4		27.4				28.5
Allowance for credit losses	(19.0)	(19.0)	(19.0)	(19.0)			(19.8)
Finance receivables, net	2,355.8		2,355.8				2,322.7
Finance Receivables Pledged as Security	2,343.7		2,343.7				2,335.1
Obligations collateralized by finance receivables, gross	1,740.9		1,740.9				1,679.1
Obligations collateralized by finance receivables	1,724.8		1,724.8				1,660.3
Changes in the allowance for credit losses
Balance at beginning of period			19.8	23.0
Provision for credit losses			17.5	25.6
Recoveries			4.4	3.4
Less charge-offs			(23.0)	(32.9)
Other			0.3	(0.1)
Balance at end of period	19.0	19.0	19.0	19.0
Floorplan receivables
Finance Receivables and Obligations Collateralized by Finance Receivables
Principal amount of receivables	2,347.1		2,347.1				2,310.5
Principal amount of receivables delinquent	7.4		7.4				14.5
Net credit losses	7.3	14.0	15.6	29.5
Other Loans
Finance Receivables and Obligations Collateralized by Finance Receivables
Principal amount of receivables	0.3		0.3				3.5
Principal amount of receivables delinquent	0.3		0.3				3.5
Net credit losses	3.0	$ 0.0	3.0	$ 0.0
AFC
Finance Receivables and Obligations Collateralized by Finance Receivables
Unamortized securitization issuance costs	(16.1)		$ (16.1)				$ (18.8)
AFC | Minimum
Finance Receivables and Obligations Collateralized by Finance Receivables
Period to define financing receivables as past due (in days)			31 days
AFC Funding Corporation
Finance Receivables and Obligations Collateralized by Finance Receivables
Committed liquidity	2,000.0		$ 2,000.0
AFC Funding Corporation | Minimum
Finance Receivables and Obligations Collateralized by Finance Receivables
Cash reserve as security for obligations of collateralized financing receivables (as a percent)			1.00%
Cash reserve as security for obligations of collateralized financing receivables - circumstance two (as a percent)			3.00%
AFCI
Finance Receivables and Obligations Collateralized by Finance Receivables
Committed liquidity					$ 375	$ 300
Cost capitalized in connection with US/Canada RPA	$ 0.3
AFCI | Minimum
Finance Receivables and Obligations Collateralized by Finance Receivables
Cash reserve as security for obligations of collateralized financing receivables (as a percent)			1.00%
Cash reserve as security for obligations of collateralized financing receivables - circumstance two (as a percent)			3.00%

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Accrued interest and fees on finance receivables managed

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The carrying amount, as of the date of the latest financial statement presented, of finance receivables which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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Gross amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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Amount of allowance for credit loss on financing receivable, classified as current.

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