Debt (Narrative) (Details) - USD ($)
|
|
|
3 Months Ended |
9 Months Ended |
12 Months Ended |
|
Mar. 07, 2019 |
Aug. 06, 2018 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Sep. 30, 2019 |
Dec. 31, 2019 |
Dec. 18, 2019 |
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Maximum hedging reserve |
|
|
|
$ 1,000,000.0
|
|
|
|
|
|
Unamortized Debt Issuance Costs |
|
|
|
(27,600,000)
|
|
|
|
$ (29,100,000)
|
|
Percentage of collections on contributed loans |
|
|
|
|
|
|
6.00%
|
|
|
Monthly servicing fee per financing |
|
|
|
|
|
|
6.00%
|
|
|
Mortgage note |
[1] |
|
|
11,100,000
|
|
|
|
11,300,000
|
|
Repayment of senior notes |
|
|
|
401,800,000
|
|
$ 0
|
|
148,200,000
|
|
Senior notes |
|
|
|
789,200,000
|
|
|
|
1,187,800,000
|
|
Proceeds from issuance of senior notes |
|
|
|
0
|
|
400,000,000.0
|
|
|
|
Loss on Extinguishment of Debt |
|
|
|
7,400,000
|
|
$ 0
|
|
1,800,000
|
|
Debt covenants |
|
|
|
1
|
|
|
|
|
|
Unamortized Discount |
|
|
|
0
|
|
|
|
(800,000)
|
|
Carrying Amount |
|
|
|
4,837,800,000
|
|
|
|
4,538,800,000
|
|
Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Unamortized Debt Issuance Costs |
|
|
|
(10,800,000)
|
|
|
|
(13,200,000)
|
|
Unamortized Discount |
|
|
|
0
|
|
|
|
(800,000)
|
|
Carrying Amount |
|
|
|
789,200,000
|
|
|
|
1,187,800,000
|
|
Mortgages [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
|
|
$ 12,000,000.0
|
$ 12,000,000.0
|
[2] |
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Chapter 4 Properties, LLC
|
|
|
|
|
|
Unamortized Debt Issuance Costs |
|
|
|
$ 0
|
|
|
|
0
|
|
Close date, secured financings |
|
|
Aug. 06, 2018
|
|
|
|
|
|
|
Mortgage note |
|
|
|
$ 11,100,000
|
|
|
|
$ 11,300,000
|
|
Debt maturity date |
|
|
Aug. 06, 2023
|
Aug. 06, 2023
|
[2] |
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.08%
|
|
|
|
3.21%
|
|
Unamortized Discount |
|
|
|
$ 0
|
|
|
|
$ 0
|
|
Carrying Amount |
|
|
|
11,100,000
|
|
|
|
11,300,000
|
|
Revolving Secured Line of Credit [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Line of credit facility |
|
|
|
$ 340,000,000.0
|
|
|
|
|
|
Percentage of net book value of loans |
|
|
|
|
|
|
80.00%
|
|
|
Debt Instrument, Issuer |
|
|
|
n/a
|
|
|
|
|
|
Unamortized Debt Issuance Costs |
[3] |
|
|
$ 0
|
|
|
|
0
|
|
Unamortized Discount |
[3] |
|
|
0
|
|
|
|
0
|
|
Carrying Amount |
[3] |
|
|
79,900,000
|
|
|
|
$ 0
|
|
Warehouse Facilities [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Percentage of net book value of loans |
|
|
|
|
|
|
80.00%
|
|
|
Number of warehouse facilities |
|
|
|
|
|
|
6
|
|
|
Debt facility financing amount |
|
|
|
1,225,000,000.0
|
|
|
|
|
|
Warehouse Facility II [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2],[4] |
|
|
$ 400,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
CAC Warehouse Funding Corp. II
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Jul. 12, 2022
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.33%
|
|
|
|
0.00%
|
|
Warehouse Facility IV [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
|
|
|
$ 300,000,000.0
|
[2],[4] |
|
|
$ 300,000,000.0
|
|
Debt Instrument, Issuer |
[2] |
|
|
CAC Warehouse Funding LLC IV
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Jul. 26, 2022
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
0.00%
|
|
|
|
0.00%
|
|
Warehouse Facility V [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2],[4] |
|
|
$ 100,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
CAC Warehouse Funding LLC V
|
|
|
|
|
|
Debt maturity date |
[2],[6] |
|
|
Aug. 17, 2021
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.48%
|
|
|
|
0.00%
|
|
Warehouse Facility VI [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 75,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
CAC Warehouse Funding LLC VI
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Sep. 30, 2022
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
0.00%
|
|
|
|
0.00%
|
|
Warehouse Facility VII [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2],[4] |
|
|
$ 150,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
CAC Warehouse Funding LLC VII
|
|
|
|
|
|
Debt maturity date |
[2],[7] |
|
|
Dec. 16, 2021
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.64%
|
|
|
|
0.00%
|
|
Term ABS 2016-3 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
0.00%
|
|
|
|
3.60%
|
|
Term ABS 2017-1 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 350,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2017-1
|
|
|
|
|
|
Debt financing close date |
|
|
|
Feb. 23, 2017
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Feb. 15, 2019
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.36%
|
|
|
|
3.19%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 437,800,000
|
|
|
|
|
|
Term ABS 2017-2 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 450,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2017-2
|
|
|
|
|
|
Debt financing close date |
|
|
|
Jun. 29, 2017
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Jun. 17, 2019
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
2.94%
|
|
|
|
2.83%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 563,200,000
|
|
|
|
|
|
Term ABS 2017-3 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 350,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2017-3
|
|
|
|
|
|
Debt financing close date |
|
|
|
Oct. 26, 2017
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Oct. 15, 2019
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
2.98%
|
|
|
|
2.91%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 437,600,000
|
|
|
|
|
|
Term ABS 2018-1 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 500,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2018-1
|
|
|
|
|
|
Debt financing close date |
|
|
|
Feb. 22, 2018
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Feb. 17, 2020
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.26%
|
|
|
|
3.24%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 625,100,000
|
|
|
|
|
|
Term ABS 2018-2 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 450,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2018-2
|
|
|
|
|
|
Debt financing close date |
|
|
|
May 24, 2018
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
May 15, 2020
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.68%
|
|
|
|
3.68%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 562,600,000
|
|
|
|
|
|
Term ABS 2018-3 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 398,300,000
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2018-3
|
|
|
|
|
|
Debt financing close date |
|
|
|
Aug. 23, 2018
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Aug. 17, 2020
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.72%
|
|
|
|
3.72%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 500,100,000
|
|
|
|
|
|
Term ABS 2019-1 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 402,500,000
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2019-1
|
|
|
|
|
|
Debt financing close date |
|
|
|
Feb. 21, 2019
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Feb. 15, 2021
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.53%
|
|
|
|
3.53%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 503,100,000
|
|
|
|
|
|
Term ABS 2019-2 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 500,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2019-2
|
|
|
|
|
|
Debt financing close date |
|
|
|
Aug. 28, 2019
|
|
|
|
|
|
Debt maturity date |
[2],[8] |
|
|
Aug. 15, 2022
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
3.13%
|
|
|
|
3.13%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 625,100,000
|
|
|
|
|
|
Term ABS 2019-3 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 351,700,000
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2019-3
|
|
|
|
|
|
Debt financing close date |
|
|
|
Nov. 21, 2019
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Nov. 15, 2021
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
2.56%
|
|
|
|
2.56%
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 439,600,000
|
|
|
|
|
|
Term ABS 2020-1 [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
[2] |
|
|
$ 500,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
[2] |
|
|
Credit Acceptance Funding LLC 2020-1
|
|
|
|
|
|
Debt financing close date |
|
|
|
Feb. 20, 2020
|
|
|
|
|
|
Debt maturity date |
[2],[5] |
|
|
Feb. 15, 2022
|
|
|
|
|
|
Senior notes yield to maturity |
|
|
|
2.18%
|
|
|
|
|
|
Net Book Value Of Loans Pledged As Collateral |
|
|
|
$ 625,100,000
|
|
|
|
|
|
2021 Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
|
|
|
|
|
|
|
|
$ 300,000,000.0
|
Senior notes |
|
|
|
$ 0
|
|
|
|
$ 151,800,000
|
|
Senior notes yield to maturity |
|
|
|
0.00%
|
|
|
|
6.125%
|
6.125%
|
2024 Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
|
|
|
$ 400,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
|
|
|
n/a
|
|
|
|
|
|
Debt maturity date |
|
|
|
Dec. 31, 2024
|
|
|
|
|
|
Senior notes |
|
|
|
$ 400,000,000.0
|
|
|
|
$ 400,000,000.0
|
$ 400,000,000.0
|
Senior notes yield to maturity |
|
|
|
5.125%
|
|
|
|
5.125%
|
5.125%
|
2026 Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt facility financing amount |
|
$ 400,000,000.0
|
|
$ 400,000,000.0
|
|
|
|
|
|
Debt Instrument, Issuer |
|
|
|
n/a
|
|
|
|
|
|
Close date, secured financings |
|
Mar. 07, 2019
|
|
|
|
|
|
|
|
Senior notes stated interest rate |
|
6.625%
|
|
|
|
|
|
|
|
Debt maturity date |
|
Mar. 15, 2026
|
|
Mar. 15, 2026
|
|
|
|
|
|
Senior notes |
|
|
|
$ 400,000,000.0
|
|
|
|
$ 400,000,000.0
|
|
Senior notes yield to maturity |
|
|
|
6.625%
|
|
|
|
6.625%
|
|
LIBOR [Member] | Mortgages [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt Instrument, Basis Spread on Variable Rate |
[2],[4] |
|
|
15000.00%
|
|
|
|
|
|
LIBOR [Member] | Revolving Secured Line of Credit [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt Instrument, Basis Spread on Variable Rate |
|
|
|
18750.00%
|
|
|
|
|
|
LIBOR [Member] | Warehouse Facility II [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt Instrument, Basis Spread on Variable Rate |
[2],[4] |
|
|
17500.00%
|
|
|
|
|
|
LIBOR [Member] | Warehouse Facility IV [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt Instrument, Basis Spread on Variable Rate |
[2],[4] |
|
|
20000.00%
|
|
|
|
|
|
LIBOR [Member] | Warehouse Facility V [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt Instrument, Basis Spread on Variable Rate |
[2],[4] |
|
|
19000.00%
|
|
|
|
|
|
LIBOR [Member] | Warehouse Facility VI [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt Instrument, Basis Spread on Variable Rate |
[2] |
|
|
20000.00%
|
|
|
|
|
|
Prime Rate [Member] | Revolving Secured Line of Credit [Member] |
|
|
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
|
|
Debt Instrument, Basis Spread on Variable Rate |
|
|
|
8750.00%
|
|
|
|
|
|
|
|