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Debt (Schedule Of General Information Of Financing Transaction) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revolving Secured Line Of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary |  | n/a |  |
Debt maturity date |  | Jun. 22, 2023 |  |
Financing Amount | [1] | $ 340,000,000.0 |  |
Revolving Secured Line Of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 187.50% |  |
Revolving Secured Line Of Credit [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 87.50% |  |
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding Corp. II |  |
Debt maturity date | [3] | Jul. 12, 2022 |  |
Debt financing amount |  | $ 400,000,000.0 | [4] | $ 400,000,000.0
Warehouse Facility II [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | [4] | 175.00% |  |
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC IV |  |
Debt maturity date | [3] | Jul. 26, 2022 |  |
Debt financing amount |  | $ 300,000,000.0 | [4] | 300,000,000.0
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC V |  |
Debt maturity date | [5] | Dec. 18, 2023 |  |
Debt financing amount |  | $ 125,000,000.0 | [4] | 100,000,000.0
Warehouse Facility V [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | [4] | 225.00% |  |
Warehouse Facility VI [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC VI |  |
Debt maturity date | [3] | Sep. 30, 2022 |  |
Debt financing amount |  | $ 75,000,000.0 |  |
Warehouse Facility VI [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | [4] | 200.00% |  |
Warehouse Facility VII [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC VII |  |
Debt maturity date | [6] | Dec. 16, 2021 |  |
Debt financing amount |  | $ 150,000,000.0 | [4] | 150,000,000.0
Warehouse Facility VII [Member] | Commercial Paper Offered Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | [4] | 200.00% |  |
Warehouse Facility VIII [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC VIII |  |
Debt maturity date | [3] | Jul. 26, 2022 |  |
Debt financing amount |  | $ 200,000,000.0 | [4] | $ 200,000,000.0
Warehouse Facility VIII [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | [4] | 190.00% |  |
Term ABS 2016-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2020-1 |  |
Debt maturity date | [3] | Feb. 15, 2022 |  |
Debt financing amount |  | $ 500,000,000.0 |  |
Term ABS 2016-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2020-2 |  |
Debt maturity date | [3] | Jul. 15, 2022 |  |
Debt financing amount |  | $ 481,800,000 |  |
Term ABS 2017-3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2017-3 |  |
Debt maturity date | [3] | Oct. 15, 2019 |  |
Debt financing amount |  | $ 350,000,000.0 |  |
Term ABS 2018-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2018-1 |  |
Debt maturity date | [3] | Feb. 17, 2020 |  |
Debt financing amount |  | $ 500,000,000.0 |  |
Term ABS 2018-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2018-2 |  |
Debt maturity date | [3] | May 15, 2020 |  |
Debt financing amount |  | $ 450,000,000.0 |  |
Term ABS 2018-3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2018-3 |  |
Debt maturity date | [3] | Aug. 17, 2020 |  |
Debt financing amount |  | $ 398,300,000 |  |
Term ABS 2019-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2019-1 |  |
Debt maturity date | [3] | Feb. 15, 2021 |  |
Debt financing amount |  | $ 402,500,000 |  |
Term ABS 2019-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2019-2 |  |
Debt maturity date | [7] | Aug. 15, 2022 |  |
Debt financing amount |  | $ 500,000,000.0 |  |
Term ABS 2019-3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2019-3 |  |
Debt maturity date | [3] | Nov. 15, 2021 |  |
Debt financing amount |  | $ 351,700,000 |  |
2024 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary |  | n/a |  |
Debt maturity date |  | Dec. 31, 2024 |  |
Debt financing amount |  | $ 400,000,000.0 |  |
2026 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary |  | n/a |  |
Debt maturity date |  | Mar. 15, 2026 |  |
Debt financing amount |  | $ 400,000,000.0 |  |
Mortgage [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Chapter 4 Properties, LLC |  |
Debt maturity date |  | Aug. 06, 2023 |  |
Debt financing amount |  | $ 12,000,000.0 |  |
Mortgage [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 150.00% |  |
TermAssetBackedSecuredFinancingsTwoThousandTwentyThree |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2020-3 |  |
Debt maturity date | [3] | Oct. 17, 2022 |  |
Debt financing amount |  | $ 600,000,000.0 |  |
[1] | The amount of the facility will decrease to $305.0 million on June 22, 2022.
[2] | Financing made available only to a specified subsidiary of the Company.
[3] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[4] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[5] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on December 16, 2025 will be due on that date.
[6] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on December 16, 2023 will be due on that date.
[7] | Represents the revolving maturity date. The Company has the option to redeem and retire the indebtedness after the revolving maturity date. If we do not elect this option, the outstanding balance will amortize based on the cash flows of the pledged assets.

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