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Summary Of Significant Accounting Policies (Schedule Of Other Income) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | $ 40.8 us-gaap_OtherIncome | $ 40.2 us-gaap_OtherIncome | $ 23.9 us-gaap_OtherIncome
Vendor Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 12.9 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_VendorFeesMember | 15.0 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_VendorFeesMember | 7.8 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_VendorFeesMember
Dealer Support Products And Services [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 10.8 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_DealerSupportProductsAndServicesMember | 9.8 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_DealerSupportProductsAndServicesMember | 8.0 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_DealerSupportProductsAndServicesMember
Ancillary Product Profit Sharing Income [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 11.1 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_AncillaryProductProfitSharingIncomeMember | 8.3 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_AncillaryProductProfitSharingIncomeMember | 3.4 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_AncillaryProductProfitSharingIncomeMember
Dealer Enrollment Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | 4.6 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_DealerEnrollmentFeesMember | 4.5 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_DealerEnrollmentFeesMember | 4.0 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = cacc_DealerEnrollmentFeesMember
Other [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other Income | $ 1.4 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 2.6 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0.7 us-gaap_OtherIncome / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember

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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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