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Other Income (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Income and Expenses [Abstract] |
Schedule Of Other Income [Table Text Block] | Other income consists of the following:
| For the Years Ended December 31,
(In millions) | 2018 |  | 2017 |  | 2016
Ancillary product profit sharing | $ | 30.6 |  |  | $ | 23.9 |  |  | $ | 15.5 |
Remarketing fees | 11.2 |  |  | 10.9 |  |  | 9.2 |
GPS-SID fees | 6.4 |  |  | 11.1 |  |  | 13.5 |
Interest | 5.0 |  |  | 2.2 |  |  | 1.7 |
Dealer enrollment fees | 4.3 |  |  | 3.9 |  |  | 5.0 |
Dealer support products and services | 4.1 |  |  | 4.8 |  |  | 4.7 |
Other | 0.8 |  |  | 0.6 |  |  | 2.3 |
Total | $ | 62.4 |  |  | $ | 57.4 |  |  | $ | 51.9 |
Disaggregation of Revenue [Table Text Block] | The following table disaggregates our other income by major source of income and timing of the revenue recognition:
(In millions) | For the Year Ended December 31, 2018
| Ancillary product profit sharing |  | Remarketing fees |  | GPS-SID fees |  | Interest |  | Dealer enrollment fees |  | Dealer support products and services |  | Other |  | Total Other Income
Source of income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Party Providers | $ | 30.6 |  |  | $ | — |  |  | $ | 6.4 |  |  | $ | 5.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.8 |  |  | $ | 42.8 |
Dealers | — |  |  | 11.2 |  |  | — |  |  | — |  |  | 4.3 |  |  | 4.1 |  |  | — |  |  | 19.6 |
Total | $ | 30.6 |  |  | $ | 11.2 |  |  | $ | 6.4 |  |  | $ | 5.0 |  |  | $ | 4.3 |  |  | 4.1 |  |  | $ | 0.8 |  |  | $ | 62.4 |
Timing of revenue recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over time | $ | 30.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 5.0 |  |  | $ | 4.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 39.9 |
At a point in time | — |  |  | 11.2 |  |  | 6.4 |  |  | — |  |  | — |  |  | 4.1 |  |  | 0.8 |  |  | 22.5 |
Total | $ | 30.6 |  |  | $ | 11.2 |  |  | $ | 6.4 |  |  | $ | 5.0 |  |  | $ | 4.3 |  |  | $ | 4.1 |  |  | $ | 0.8 |  |  | $ | 62.4 |

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- Definition Schedule Of Other Income [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | cacc_
Data Type: | nonnum:textBlockItemType
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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