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Debt (Schedule Of General Information Of Financing Transaction) (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 30, 2015 | Jan. 22, 2014 | Dec. 31, 2018 | Dec. 31, 2017
Revolving Secured Line Of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary |  |  |  | n/a |  |
Debt maturity date |  |  |  | Jun. 22, 2021 |  |
Financing Amount | [1] |  |  | $ 350,000,000 |  |
Revolving Secured Line Of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.875% |  |
Revolving Secured Line Of Credit [Member] | Prime Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.875% |  |
Warehouse Facility II [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | CAC Warehouse Funding Corp. II |  |
Debt maturity date | [3] |  |  | Dec. 20, 2020 |  |
Debt financing amount |  |  |  | $ 400,000,000 | [4] | $ 400,000,000
Warehouse Facility II [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.75% |  |
Warehouse Facility IV [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | CAC Warehouse Funding LLC IV |  |
Debt maturity date | [3] |  |  | Apr. 30, 2020 |  |
Debt financing amount |  |  |  | $ 250,000,000 | [4] | 100,000,000
Warehouse Facility IV [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.25% |  |
Warehouse Facility V [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | CAC Warehouse Funding LLC V |  |
Debt maturity date | [5] |  |  | Aug. 17, 2021 |  |
Debt financing amount |  |  |  | $ 100,000,000 | [4] | 100,000,000
Warehouse Facility V [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.90% |  |
Warehouse Facility VI [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | CAC Warehouse Funding LLC VI |  |
Debt maturity date | [3] |  |  | Sep. 30, 2020 |  |
Debt financing amount |  |  |  | $ 75,000,000 |  |
Warehouse Facility VI [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.00% |  |
Warehouse Facility VII [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | CAC Warehouse Funding LLC VII |  |
Debt maturity date | [6] |  |  | Dec. 17, 2020 |  |
Debt financing amount |  |  |  | $ 150,000,000 | [4] | 150,000,000
Warehouse Facility VII [Member] | Commercial Paper Offered Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.00% |  |
Term ABS 2016-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | Credit Acceptance Funding LLC 2016-1 |  |
Debt maturity date | [3] |  |  | Feb. 15, 2018 |  |
Debt financing amount |  |  |  | $ 385,000,000 | [4] | $ 385,000,000
Term ABS 2016-1 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.95% |  |
Term ABS 2016-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | Credit Acceptance Funding LLC 2016-2 |  |
Debt maturity date | [3] |  |  | May 15, 2018 |  |
Debt financing amount |  |  |  | $ 350,200,000 |  |
Term ABS 2016-3 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | Credit Acceptance Funding LLC 2016-3 |  |
Debt maturity date | [3] |  |  | Oct. 15, 2018 |  |
Debt financing amount |  |  |  | $ 350,000,000 |  |
Term ABS 2017-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | Credit Acceptance Funding LLC 2017-1 |  |
Debt maturity date | [3] |  |  | Feb. 15, 2019 |  |
Debt financing amount |  |  |  | $ 350,000,000 |  |
Term ABS 2017-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [2] |  |  | Credit Acceptance Funding LLC 2017-2 |  |
Debt maturity date | [3] |  |  | Jun. 17, 2019 |  |
Debt financing amount |  |  |  | $ 450,000,000 |  |
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 |  |
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 |  |
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 |  |
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 |  |
2021 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary |  |  |  | n/a |  |
Debt maturity date |  |  | Feb. 15, 2021 | Feb. 15, 2021 |  |
Debt financing amount |  |  | $ 300,000,000 | $ 300,000,000 |  |
2023 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary |  |  |  | n/a |  |
Debt maturity date |  | Mar. 15, 2023 |  | Mar. 15, 2023 |  |
Debt financing amount |  | $ 250,000,000 |  | $ 250,000,000 |  |
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 |  |
Mortgage [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.50% |  |
Mortgage [Member] | Commercial Paper Offered Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |
[1] | The amount of the facility will decrease to $315.0 million on June 22, 2019.
[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 August 17, 2023 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 17, 2022 will be due on that date.

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