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Debt (Narrative) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 9 Months Ended
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Jun. 23, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Revolving Secured Line of Credit [Member] | Sep. 30, 2014 Warehouse Facilities [Member] facility | Sep. 30, 2014 Warehouse Facility II [Member] | Sep. 30, 2014 Warehouse Facility IV [Member] | Sep. 30, 2014 Warehouse Facility IV And V [Member] | Sep. 15, 2014 Warehouse Facility IV And V [Member] | Feb. 21, 2014 2017 Senior Notes [Member] | Sep. 30, 2014 2017 Senior Notes [Member] | Jan. 22, 2014 2021 Senior Notes [Member] | Sep. 30, 2014 2021 Senior Notes [Member] | Jan. 22, 2014 2021 Senior Notes [Member] | Sep. 30, 2014 Term ABS 2012-1 [Member] | Sep. 30, 2014 Term ABS 2012-2 [Member] | Sep. 30, 2014 Term ABS 2013-1 [Member] | Sep. 30, 2014 Term ABS 2013-2 [Member] | Sep. 30, 2014 Term ABS 2014-1 [Member] | Sep. 30, 2014 Term ABS 2014-2 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  | $ 235,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net book value of loans |  |  |  |  |  | 0.00% | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum hedging reserve |  | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warehouse facilities |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt facility financing amount |  |  |  |  |  |  | 475,000,000 | 325,000,000 | [1] | 75,000,000 | [1] | 75,000,000 | 75,000,000 |  |  |  | 300,000,000 | 300,000,000 | 201,300,000.0 | [1] | 252,000,000 | [1] | 140,300,000.0 | [1] | 197,800,000.0 | [1] | 299,000,000 | [1] | 349,000,000.0 | [1]
Wholly-owned Subsidiary |  |  |  |  |  | n/a |  | CAC Warehouse Funding Corp. II | [1] | CAC Warehouse Funding LLC IV | [1] |  |  |  |  |  | n/a |  | Credit Acceptance Funding LLC 2012-1 | [1] | Credit Acceptance Funding LLC 2012-2 | [1] | Credit Acceptance Funding LLC 2013-1 | [1] | Credit Acceptance Funding LLC 2013-2 | [1] | Credit Acceptance Funding LLC 2014-1 | [1] | Credit Acceptance Funding LLC 2014-2 | [1]
Percentage of collections on contributed loans |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly servicing fee per financing |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt financing close date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 29, 2012 |  | Sep. 20, 2012 |  | Apr. 25, 2013 |  | Oct. 31, 2013 |  | Apr. 16, 2014 |  | Sep. 25, 2014 |
Close date, secured financings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 22, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.125% |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |
Repayment of senior notes |  |  |  | 350,000,000 | 0 |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  | 104.563% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | 0 | 0 | 21,800,000 | 0 |  |  |  |  |  |  |  |  | (21,800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of other debt | 3,600,000 |  |  | 3,800,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt covenants |  | $ 1 |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Financing made available only to a specified subsidiary of the Company.

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