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Summary Of Significant Accounting Policies (Schedule Of Trust Assets And Reinsurance Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash and cash equivalents | $ 157.6 us-gaap_RestrictedCashAndCashEquivalents |  | $ 111.3 us-gaap_RestrictedCashAndCashEquivalents |
Restricted securities available for sale | 53.2 us-gaap_AvailableForSaleSecuritiesRestricted |  | 53.6 us-gaap_AvailableForSaleSecuritiesRestricted |
Accounts payable and accrued liabilities | 114.4 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent |  | 113.8 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent |
Trust Assets [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash and cash equivalents | 0.2 us-gaap_RestrictedCashAndCashEquivalents / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_TrustAssetsMember |  | 1.2 us-gaap_RestrictedCashAndCashEquivalents / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_TrustAssetsMember |
Restricted securities available for sale | 53.2 us-gaap_AvailableForSaleSecuritiesRestricted / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_TrustAssetsMember |  | 53.6 us-gaap_AvailableForSaleSecuritiesRestricted / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_TrustAssetsMember |
Unearned Premium [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accounts payable and accrued liabilities | 38.4 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_UnearnedPremiumMember |  | 42.4 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_UnearnedPremiumMember |
Claims Reserve [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accounts payable and accrued liabilities | $ 1.5 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_ClaimsReserveMember | [1] | $ 1.7 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent / cacc_TrustAssetsAndReinsuranceLiabilitiesAxis = cacc_ClaimsReserveMember | [1]
[1] | The claims reserve is estimated based on historical claims experience.

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(1),(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 1, 5 -Article 9 + Details
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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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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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