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Debt (Schedule of General Information of Financing Transaction) (Details) - USD ($) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2015 | Jan. 22, 2014 | Sep. 30, 2016 | Oct. 27, 2016 | [1] | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |
Debt facility financing amount |  |  |  | $ 2,528,200,000 | $ 350,000,000 | $ 2,086,300,000
Revolving Secured Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary |  |  |  | n/a |  |
Line of credit maturity date |  |  |  | Jun. 22, 2019 |  |
Financing Amount |  |  |  | $ 310,000,000 |  |
Debt facility financing amount | [2] |  |  | $ 85,200,000 |  | $ 57,700,000
Revolving Secured Line of Credit [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.875% |  |
Revolving Secured Line of Credit [Member] | Prime Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.875% |  |
Warehouse Facility II [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding Corp. II |  |
Debt maturity date | [1],[3] |  |  | Jun. 23, 2019 |  |
Debt facility financing amount | [1],[4] |  |  | $ 400,000,000 |  |
Warehouse Facility II [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | [1],[3] |  |  | 2.25% |  |
Warehouse Facility IV [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding LLC IV |  |
Debt maturity date | [1],[3] |  |  | Apr. 30, 2018 |  |
Debt facility financing amount | [1],[4] |  |  | $ 75,000,000 |  |
Warehouse Facility IV [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | [1],[3] |  |  | 2.00% |  |
Warehouse Facility V [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding LLC V |  |
Debt maturity date | [1],[5] |  |  | Aug. 18, 2019 |  |
Debt facility financing amount | [1],[4] |  |  | $ 100,000,000 |  |
Warehouse Facility V [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | [1],[3] |  |  | 1.60% |  |
Warehouse Facility VI [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | CAC Warehouse Funding LLC VI |  |
Debt maturity date | [1],[3] |  |  | Sep. 30, 2018 |  |
Debt facility financing amount | [1] |  |  | $ 75,000,000 |  |
Warehouse Facility VI [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | [1],[3] |  |  | 2.00% |  |
Term ABS 2013-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2013-2 |  |
Debt maturity date | [1],[3] |  |  | Oct. 15, 2015 |  |
Debt facility financing amount | [1] |  |  | $ 197,800,000.0 |  |
Term ABS 2014-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2014-1 |  |
Debt maturity date | [1],[3] |  |  | Apr. 15, 2016 |  |
Debt facility financing amount | [1] |  |  | $ 299,000,000 |  |
Term ABS 2014-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2014-2 |  |
Debt maturity date | [1],[3] |  |  | Sep. 15, 2016 |  |
Debt facility financing amount | [1] |  |  | $ 349,000,000.0 |  |
Term ABS 2015-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2015-1 |  |
Debt maturity date | [1],[3] |  |  | Jan. 16, 2017 |  |
Debt facility financing amount | [1] |  |  | $ 300,600,000 |  |
Term ABS 2015-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2015-2 |  |
Debt maturity date | [1],[3] |  |  | Aug. 15, 2017 |  |
Debt facility financing amount | [1] |  |  | $ 300,200,000 |  |
Term ABS 2016-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2016-1 |  |
Debt maturity date | [1],[3] |  |  | Feb. 15, 2018 |  |
Debt facility financing amount | [1] |  |  | $ 385,000,000 |  |
Basis spread on variable rate | [1],[3] |  |  | 1.95% |  |
Term ABS 2016-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary | [1] |  |  | Credit Acceptance Funding LLC 2016-2 |  |
Debt maturity date | [1],[3] |  |  | May 15, 2018 |  |
Debt facility financing amount | [1] |  |  | $ 350,200,000 |  |
2021 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Wholly-owned Subsidiary |  |  |  | n/a |  |
Debt maturity date |  |  | Feb. 15, 2021 | Feb. 15, 2021 |  |
Debt facility 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 facility financing amount |  | $ 250,000,000.0 |  | $ 250,000,000 |  |
[1] | Financing made available only to a specified subsidiary of the Company.
[2] | Excludes deferred debt issuance costs of $2.6 million and $2.2 million as of September 30, 2016 and December 31, 2015, respectively, which are included in other assets.
[3] | Represents the revolving maturity date. The outstanding balance will amortize after the 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 18, 2021 will be due.

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