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Finance Receivables and Obligations Collateralized by Finance Receivables (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 CAD ($) | Mar. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2020 USD ($)
Finance Receivables and Obligations Collateralized by Finance Receivables |  |  |  |  |  |  |  |  |
Cost capitalized in connection with US/Canada RPA | $ 6.7 | $ 11.6 | $ 0.6 |  |  |  |  |  |
Principal amount of receivables | 2,305.0 | 2,416.6 |  |  |  |  |  |  |
Principal amount of receivables delinquent | 23.7 | 17.5 |  |  |  |  |  |  |
Net credit losses | 49.2 | 11.1 |  |  |  |  |  |  |
Allowance for losses | 23.0 | 21.5 | $ 23.0 |  |  |  |  |  | $ 22.0
Finance Receivables Pledged as Security | 2,296.4 | 2,396.6 |  |  |  |  |  |  |
Obligations collateralized by finance receivables, gross | 1,645.4 | 1,697.0 |  |  |  |  |  |  |
Obligations collateralized by finance receivables | 1,631.9 | 1,677.6 |  |  |  |  |  |  |
Finance receivables, net of allowances | 2,282.0 | 2,395.1 |  |  |  |  |  |  |
Floorplan receivables |  |  |  |  |  |  |  |  |
Finance Receivables and Obligations Collateralized by Finance Receivables |  |  |  |  |  |  |  |  |
Principal amount of receivables | 2,301.4 | 2,409.9 |  |  |  |  |  |  |
Principal amount of receivables delinquent | 23.7 | 17.5 |  |  |  |  |  |  |
Net credit losses | 49.2 | 11.1 |  |  |  |  |  |  |
Other Loans |  |  |  |  |  |  |  |  |
Finance Receivables and Obligations Collateralized by Finance Receivables |  |  |  |  |  |  |  |  |
Principal amount of receivables | 3.6 | 6.7 |  |  |  |  |  |  |
Principal amount of receivables delinquent | 0.0 | 0.0 |  |  |  |  |  |  |
Net credit losses | 0.0 | 0.0 |  |  |  |  |  |  |
AFC |  |  |  |  |  |  |  |  |
Finance Receivables and Obligations Collateralized by Finance Receivables |  |  |  |  |  |  |  |  |
Allowance for losses | 23.0 | 21.5 |  |  |  |  |  |  |
Unamortized securitization issuance costs | $ (13.5) | (19.4) |  |  |  |  |  |  |
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 | $ 1,700.0 |
Cost capitalized in connection with US/Canada RPA |  | 10.5 |  |  |  |  |  |  |
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 |  |  |  | $ 300 | $ 300 | $ 225 |  |  |
Cost capitalized in connection with US/Canada RPA | $ 0.6 | $ 1.1 |  |  |  |  |  |  |
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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- Definition Represents the cash reserve maintained as a percentage of finance receivables securitized, which serves as security for the obligations collateralized by the financing receivables. + References No definition available. + Details
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- Definition Represents the cash reserve maintained when certain circumstances are triggered as a percentage of finance receivables securitized, which serves as security for the obligations collaterized by the financing receivables. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount of allowance for credit loss on financing receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-4 + Details
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- Definition Amount of net credit losses charged off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e)(5) -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Amortized cost, after allowance for credit loss, of financing receivable classified as current. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-9 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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- Definition This is the amount of the financial instruments that are considered delinquent (past due) at the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Carrying 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-1A + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References No definition available. + Details
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