XML 84 R67.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Reinsurance (Cumulative Paid Claims) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | $ 136.0 |  |  |  |
Incident Year 2015 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 33.4 | $ 33.4 | $ 33.4 | $ 33.4 | $ 31.9
Incident Year 2016 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 26.0 | 26.0 | 26.0 | $ 24.7 |
Incident Year 2017 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 22.6 | 22.5 | $ 21.3 |  |
Incident Year 2018 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 25.7 | $ 24.2 |  |  |
Incident Year 2019 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | $ 28.3 |  |  |  |

X
- Definition Cumulative Paid Claims + References No definition available. + Details
Name: | cacc_CumulativePaidClaims
Namespace Prefix: | cacc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition [Line Items] for Cumulative Paid Claims [Table] + References No definition available. + Details
Name: | cacc_CumulativePaidClaimsLineItems
Namespace Prefix: | cacc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cacc_IncidentYearAxis=cacc_IncidentYear2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |