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Debt (Schedule Of General Information Of Financing Transaction) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revolving Secured Line Of Credit [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary n/a  
Debt maturity date Jun. 22, 2023  
Financing Amount [1] $ 340,000,000.0  
Revolving Secured Line Of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 187.50%  
Revolving Secured Line Of Credit [Member] | Prime Rate [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 87.50%  
Warehouse Facility II [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] CAC Warehouse Funding Corp. II  
Debt maturity date [3] Jul. 12, 2022  
Debt financing amount $ 400,000,000.0 [4] $ 400,000,000.0
Warehouse Facility II [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate [4] 175.00%  
Warehouse Facility IV [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] CAC Warehouse Funding LLC IV  
Debt maturity date [3] Jul. 26, 2022  
Debt financing amount $ 300,000,000.0 [4] 300,000,000.0
Warehouse Facility V [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] CAC Warehouse Funding LLC V  
Debt maturity date [5] Dec. 18, 2023  
Debt financing amount $ 125,000,000.0 [4] 100,000,000.0
Warehouse Facility V [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate [4] 225.00%  
Warehouse Facility VI [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] CAC Warehouse Funding LLC VI  
Debt maturity date [3] Sep. 30, 2022  
Debt financing amount $ 75,000,000.0  
Warehouse Facility VI [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate [4] 200.00%  
Warehouse Facility VII [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] CAC Warehouse Funding LLC VII  
Debt maturity date [6] Dec. 16, 2021  
Debt financing amount $ 150,000,000.0 [4] 150,000,000.0
Warehouse Facility VII [Member] | Commercial Paper Offered Rate [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate [4] 200.00%  
Warehouse Facility VIII [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] CAC Warehouse Funding LLC VIII  
Debt maturity date [3] Jul. 26, 2022  
Debt financing amount $ 200,000,000.0 [4] $ 200,000,000.0
Warehouse Facility VIII [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate [4] 190.00%  
Term ABS 2016-1 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2020-1  
Debt maturity date [3] Feb. 15, 2022  
Debt financing amount $ 500,000,000.0  
Term ABS 2016-2 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2020-2  
Debt maturity date [3] Jul. 15, 2022  
Debt financing amount $ 481,800,000  
Term ABS 2017-3 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2017-3  
Debt maturity date [3] Oct. 15, 2019  
Debt financing amount $ 350,000,000.0  
Term ABS 2018-1 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2018-1  
Debt maturity date [3] Feb. 17, 2020  
Debt financing amount $ 500,000,000.0  
Term ABS 2018-2 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2018-2  
Debt maturity date [3] May 15, 2020  
Debt financing amount $ 450,000,000.0  
Term ABS 2018-3 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2018-3  
Debt maturity date [3] Aug. 17, 2020  
Debt financing amount $ 398,300,000  
Term ABS 2019-1 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2019-1  
Debt maturity date [3] Feb. 15, 2021  
Debt financing amount $ 402,500,000  
Term ABS 2019-2 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2019-2  
Debt maturity date [7] Aug. 15, 2022  
Debt financing amount $ 500,000,000.0  
Term ABS 2019-3 [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2019-3  
Debt maturity date [3] Nov. 15, 2021  
Debt financing amount $ 351,700,000  
2024 Senior Notes [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary n/a  
Debt maturity date Dec. 31, 2024  
Debt financing amount $ 400,000,000.0  
2026 Senior Notes [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary n/a  
Debt maturity date Mar. 15, 2026  
Debt financing amount $ 400,000,000.0  
Mortgage [Member]    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Chapter 4 Properties, LLC  
Debt maturity date Aug. 06, 2023  
Debt financing amount $ 12,000,000.0  
Mortgage [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 150.00%  
TermAssetBackedSecuredFinancingsTwoThousandTwentyThree    
Debt Instrument [Line Items]    
Wholly-owned Subsidiary [2] Credit Acceptance Funding LLC 2020-3  
Debt maturity date [3] Oct. 17, 2022  
Debt financing amount $ 600,000,000.0  
[1] The amount of the facility will decrease to $305.0 million on June 22, 2022.
[2] Financing made available only to a specified subsidiary of the Company.
[3] Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[4] Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[5] Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on December 16, 2025 will be due on that date.
[6] Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on December 16, 2023 will be due on that date.
[7] Represents the revolving maturity date. The Company has the option to redeem and retire the indebtedness after the revolving maturity date. If we do not elect this option, the outstanding balance will amortize based on the cash flows of the pledged assets.