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Debt (Schedule Of General Information Of Financing Transaction) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Debt Instrument [Line Items]  
Wholly-owned Subsidiary n/a
Debt maturity date Feb. 15, 2021
Debt financing amount $ 300.0us-gaap_DebtInstrumentFaceAmount
Revolving Secured Line Of Credit [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary n/a
Debt maturity date Jun. 23, 2017
Financing Amount 235.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Warehouse Facility II [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary CAC Warehouse Funding Corp. II [1],[2]
Debt maturity date Jul. 18, 2017 [1],[3]
Debt financing amount 325.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIiMember		 [1]
Warehouse Facility IV [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary CAC Warehouse Funding LLC IV [1],[2]
Debt maturity date Apr. 05, 2016 [1],[3]
Debt financing amount 75.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityIVMember		 [1]
Warehouse Facility V [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary CAC Warehouse Funding LLC V [1],[2],[4]
Debt maturity date Sep. 10, 2017 [1],[5]
Debt financing amount 75.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_WarehouseFacilityVMember		 [1]
Term ABS 2012-1 [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2012-1 [1]
Debt maturity date Mar. 17, 2014 [1],[3]
Debt financing amount 201.3us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveOneMember		 [1]
Term ABS 2012-2 [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2012-2 [1]
Debt maturity date Sep. 15, 2014 [1],[3]
Debt financing amount 252.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandTwelveTwoMember		 [1]
Term ABS 2013-1 [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2013-1 [1]
Debt maturity date Apr. 15, 2015 [1],[3]
Debt financing amount 140.3us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenOneMember		 [1]
Term ABS 2013-2 [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2013-2 [1]
Debt maturity date Oct. 15, 2015 [1],[3]
Debt financing amount 197.8us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandThirteenTwoMember		 [1]
Term ABS 2014-1 [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2014-1 [1]
Debt maturity date Apr. 15, 2016 [1],[3]
Debt financing amount 299.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenOneMember		 [1]
Term ABS 2014-2 [Member]  
Debt Instrument [Line Items]  
Wholly-owned Subsidiary Credit Acceptance Funding LLC 2014-2 [1]
Debt maturity date Sep. 15, 2016 [1],[3]
Debt financing amount $ 349.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cacc_TermAssetBackedSecuredFinancingsTwoThousandFourteenTwoMember		 [1]
[1] Financing made available only to a specified subsidiary of the Company.
[2] Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[3] Represents the revolving maturity date. The outstanding balance will amortize after the maturity date based on the cash flows of the pledged assets.
[4] In connection with the renewal of this warehouse facility in the third quarter of 2014, we formed a new wholly owned subsidiary, CAC Warehouse Funding LLC V, which replaced CAC Warehouse Funding III, LLC.
[5] Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on September 10, 2019 will be due.