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v2.4.1.9

Restricted Securities Available For Sale (Restricted Securities Available For Sale) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | $ 53.3 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost | $ 53.9 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains | 0.1 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain
Gross Unrealized Losses | (0.2)cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses | (0.3)cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses
Total restricted securities available for sale | 53.2 us-gaap_AvailableForSaleSecuritiesRestricted | 53.6 us-gaap_AvailableForSaleSecuritiesRestricted
Corporate Bond [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 19.1 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 3.1 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Gross Unrealized Gains | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Gross Unrealized Losses | (0.1)cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | (0.1)cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Total restricted securities available for sale | 19.0 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 3.0 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
US Government And Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 28.8 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 22.3 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Gains | 0.1 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Losses | (0.1)cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | (0.2)cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Total restricted securities available for sale | 28.8 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 22.1 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Asset-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 4.8 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Gross Unrealized Gains | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Gross Unrealized Losses | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Total restricted securities available for sale | 4.8 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Collateralized Mortgage Backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost | 0.6 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
Gross Unrealized Gains | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
Gross Unrealized Losses | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
Total restricted securities available for sale | 0.6 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
Commercial Paper [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost |  | 23.9 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Gross Unrealized Gains |  | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Gross Unrealized Losses |  | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Total restricted securities available for sale |  | 23.9 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Certificates of Deposit [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cost |  | 4.6 cacc_RestrictedAvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Gross Unrealized Gains |  | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Gross Unrealized Losses |  | 0 cacc_RestrictedAvailableForSaleSecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Total restricted securities available for sale |  | $ 4.6 us-gaap_AvailableForSaleSecuritiesRestricted / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember

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- Definition The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph b -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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