Credit Acceptance (CACC) 10-Q 31 Jul 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 24, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Entity Registrant Name	CREDIT ACCEPTANCE CORP
Entity Central Index Key	885,550
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		19,310,272

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
ASSETS:
Cash and cash equivalents		$ 27.2	$ 14.6
Restricted cash and cash equivalents		313.9	224.7
Restricted securities available for sale	[1]	46.5	45.3
Loans receivable (including $1.4 from affiliates as of December 31, 2016)		4,637.7	4,207
Allowance for credit losses		(354.1)	(320.4)
Loans receivable, net		4,283.6	3,886.6
Property and equipment, net		20	18.2
Income taxes receivable		8.4	2.3
Other assets		28.2	26.3
Total Assets		4,727.8	4,218
Liabilities:
Accounts payable and accrued liabilities		140.4	143.9
Secured financing		2,472.3	2,062.4
Senior notes		542.1	541.3
Deferred income taxes, net		324.6	273.1
Income taxes payable		0.2	23.6
Total Liabilities		3,479.6	3,044.3
Commitments and Contingencies - See Note 15
Shareholders' Equity:
Preferred stock, $0.01 par value, 1,000,000 shares authorized, none issued		0	0
Common stock, $0.01 par value, 80,000,000 shares authorized, 19,310,346 and 19,877,381 shares issued and outstanding as of June 30, 2017 and December 31, 2016, respectively		0.2	0.2
Paid-in capital		135.5	131.7
Retained earnings		1,112.5	1,042
Accumulated other comprehensive loss		0	(0.2)
Total Shareholders' Equity		1,248.2	1,173.7
Total Liabilities and Shareholders' Equity		$ 4,727.8	$ 4,218
[1]	Measured and recorded at fair value on a recurring basis.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Loans receivable, from affiliates	$ 0	$ 1.4
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	19,310,346	19,877,381
Common stock, shares outstanding	19,310,346	19,877,381

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Finance charges	$ 251.8	$ 215.2	$ 489.8	$ 418
Premiums earned	10.5	10.9	20.6	21.7
Other income	13.7	12.4	28.4	26.7
Total revenue	276	238.5	538.8	466.4
Costs and expenses:
Salaries and wages	32.7	30.1	68.2	62.8
General and administrative	14	12.6	27.9	24.7
Sales and marketing	14.4	11.9	29.5	25.6
Provision for credit losses	21.8	17.9	42.3	40
Interest	29.9	24.3	57.5	46.4
Provision for claims	6.1	7	12.1	13.8
Total costs and expenses	118.9	103.8	237.5	213.3
Income before provision for income taxes	157.1	134.7	301.3	253.1
Provision for income taxes	58	49.8	108.9	93.8
Net income	$ 99.1	$ 84.9	$ 192.4	$ 159.3
Net income per share:
Basic (in usd per share)	$ 5.09	$ 4.17	$ 9.82	$ 7.81
Diluted (in usd per share)	$ 5.09	$ 4.17	$ 9.81	$ 7.80
Weighted average shares outstanding:
Basic (in shares)	19,458,155	20,379,557	19,589,593	20,407,379
Diluted (in shares)	19,463,521	20,382,804	19,615,849	20,433,524

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 99.1	$ 84.9	$ 192.4	$ 159.3
Other comprehensive income, net of tax:
Unrealized gain (loss) on securities, net of tax	0.1	0.1	0.2	0.5
Other comprehensive income	0.1	0.1	0.2	0.5
Comprehensive income	$ 99.2	$ 85	$ 192.6	$ 159.8

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities:
Net income	$ 192.4	$ 159.3
Adjustments to reconcile cash provided by operating activities:
Provision for credit losses	42.3	40
Depreciation	3.2	3.2
Amortization	5.1	4.4
Loss on retirement of property and equipment	0.1
Provision for deferred income taxes	51.5	16.5
Stock-based compensation	5.4	3.8
Change in operating assets and liabilities:
Increase (decrease) in accounts payable and accrued liabilities	(8.7)	2.6
Increase in income taxes receivable	(6.1)	0
Decrease in income taxes payable	(23.4)	0
Increase in other assets	(0.8)	(1.3)
Net cash provided by operating activities	261	228.5
Cash Flows From Investing Activities:
Increase in restricted cash and cash equivalents	(89.2)	(66.3)
Purchases of restricted securities available for sale	(21.6)	(18.7)
Proceeds from sale of restricted securities available for sale	16.7	19
Maturities of restricted securities available for sale	3.8	2.1
Principal collected on Loans receivable	1,116.3	1,003.4
Advances to Dealers	(993.2)	(1,000.7)
Purchases of Consumer Loans	(470.1)	(370.8)
Accelerated payments of Dealer Holdback	(23.6)	(29.7)
Payments of Dealer Holdback	(68.7)	(75.8)
Purchases of property and equipment	(5.1)	(2.9)
Net cash used in investing activities	(534.7)	(540.4)
Cash Flows From Financing Activities:
Borrowings under revolving secured line of credit	2,523.6	1,036.1
Repayments under revolving secured line of credit	(2,523.6)	(1,093.8)
Proceeds from secured financing	1,664.5	1,397.3
Repayments of secured financing	(1,251.4)	(868.5)
Payments of debt issuance costs	(8.5)	(5.5)
Repurchase of common stock	(123.5)	(40.8)
Excess tax benefits from stock-based compensation plans	0	27.2
Proceeds from (Payments for) Other Financing Activities	5.2	11.9
Net cash provided by financing activities	286.3	463.9
Net increase in cash and cash equivalents	12.6	152
Cash and cash equivalents, beginning of period	14.6	6.3
Cash and cash equivalents, end of period	27.2	158.3
Supplemental Disclosure of Cash Flow Information:
Cash paid during the period for interest	52	41.6
Cash paid during the period for income taxes	$ 85.7	$ 47.8

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“generally accepted accounting principles” or “GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The results of operations for interim periods are not necessarily indicative of actual results achieved for full fiscal years. The consolidated balance sheet as of December 31, 2016 has been derived from the audited financial statements at that date but does not include all the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2016 for Credit Acceptance Corporation (the “Company”, “Credit Acceptance”, “we”, “our” or “us”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. We have evaluated events and transactions occurring subsequent to the consolidated balance sheet date of June 30, 2017 for items that could potentially be recognized or disclosed in these financial statements. For additional information regarding subsequent events, see Note 16 of these consolidated financial statements. Reclassification Certain amounts for prior periods have been reclassified to conform to the current presentation. We have reclassified certain prior period related party transactions to reflect the June 2016 sale of certain affiliated Dealers by our founder, significant shareholder and former Chairman of the Board. For additional information regarding this change, see Note 10 to the consolidated financial statements.

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 2017
Description Of Business [Abstract]
Description of Business	DESCRIPTION OF BUSINESS Since 1972, Credit Acceptance has offered financing programs that enable automobile dealers to sell vehicles to consumers, regardless of their credit history. Our financing programs are offered through a nationwide network of automobile dealers who benefit from sales of vehicles to consumers who otherwise could not obtain financing; from repeat and referral sales generated by these same customers; and from sales to customers responding to advertisements for our financing programs, but who actually end up qualifying for traditional financing. Without our financing programs, consumers are often unable to purchase vehicles or they purchase unreliable ones. Further, as we report to the three national credit reporting agencies, an important ancillary benefit of our programs is that we provide consumers with an opportunity to improve their lives by improving their credit score and move on to more traditional sources of financing. We refer to automobile dealers who participate in our programs and who share our commitment to changing consumers’ lives as “Dealers”. Upon enrollment in our financing programs, the Dealer enters into a Dealer servicing agreement with us that defines the legal relationship between Credit Acceptance and the Dealer. The Dealer servicing agreement assigns the responsibilities for administering, servicing, and collecting the amounts due on retail installment contracts (referred to as “Consumer Loans”) from the Dealers to us. We are an indirect lender from a legal perspective, meaning the Consumer Loan is originated by the Dealer and assigned to us. Substantially all of the Consumer Loans assigned to us are made to consumers with impaired or limited credit histories. The following table shows the percentage of Consumer Loans assigned to us with either FICO ® scores below 650 or no FICO ® scores: For the Three Months Ended June 30, For the Six Months Ended June 30, Consumer Loan Assignment Volume 2017 2016 2017 2016 Percentage of total unit volume with either FICO ® scores below 650 or no FICO ® scores 95.3 % 95.4 % 95.9 % 96.1 % We have two programs: the Portfolio Program and the Purchase Program. Under the Portfolio Program, we advance money to Dealers (referred to as a “Dealer Loan”) in exchange for the right to service the underlying Consumer Loans. Under the Purchase Program, we buy the Consumer Loans from the Dealers (referred to as a “Purchased Loan”) and keep all amounts collected from the consumer. Dealer Loans and Purchased Loans are collectively referred to as “Loans”. The following table shows the percentage of Consumer Loans assigned to us as Dealer Loans and Purchased Loans for each of the last six quarters: Unit Volume Dollar Volume (1) Three Months Ended Dealer Loans Purchased Loans Dealer Loans Purchased Loans March 31, 2016 82.4 % 17.6 % 75.6 % 24.4 % June 30, 2016 77.8 % 22.2 % 69.8 % 30.2 % September 30, 2016 76.2 % 23.8 % 68.5 % 31.5 % December 31, 2016 76.9 % 23.1 % 71.1 % 28.9 % March 31, 2017 73.3 % 26.7 % 67.8 % 32.2 % June 30, 2017 72.3 % 27.7 % 67.9 % 32.1 % (1) Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. Payments of Dealer Holdback and accelerated Dealer Holdback are not included. Portfolio Program As payment for the vehicle, the Dealer generally receives the following: • a down payment from the consumer; • a non-recourse cash payment (“advance”) from us; and • after the advance has been recovered by us, the cash from payments made on the Consumer Loan, net of certain collection costs and our servicing fee (“Dealer Holdback”). We record the amount advanced to the Dealer as a Dealer Loan, which is classified within Loans receivable in our consolidated balance sheets. Cash advanced to the Dealer is automatically assigned to the Dealer’s open pool of advances. We generally require Dealers to group advances into pools of at least 100 Consumer Loans. At the Dealer’s option, a pool containing at least 100 Consumer Loans can be closed and subsequent advances assigned to a new pool. All advances within a Dealer’s pool are secured by the future collections on the related Consumer Loans assigned to the pool. For Dealers with more than one pool, the pools are cross-collateralized so the performance of other pools is considered in determining eligibility for Dealer Holdback. We perfect our security interest in the Dealer Loans by taking possession of the Consumer Loans, which list us as lien holder on the vehicle title. The Dealer servicing agreement provides that collections received by us during a calendar month on Consumer Loans assigned by a Dealer are applied on a pool-by-pool basis as follows: • first, to reimburse us for certain collection costs; • second, to pay us our servicing fee, which generally equals 20% of collections; • third, to reduce the aggregate advance balance and to pay any other amounts due from the Dealer to us; and • fourth, to the Dealer as payment of Dealer Holdback. If the collections on Consumer Loans from a Dealer’s pool are not sufficient to repay the advance balance and any other amounts due to us, the Dealer will not receive Dealer Holdback. Dealers have an opportunity to receive an accelerated Dealer Holdback payment each time 100 Consumer Loans have been assigned to us. The amount paid to the Dealer is calculated using a formula that considers the forecasted collections and the advance balance on the related Consumer Loans. Since typically the combination of the advance and the consumer’s down payment provides the Dealer with a cash profit at the time of sale, the Dealer’s risk in the Consumer Loan is limited. We cannot demand repayment of the advance from the Dealer except in the event the Dealer is in default of the Dealer servicing agreement. Advances are made only after the consumer and Dealer have signed a Consumer Loan contract, we have received the executed Consumer Loan contract and supporting documentation in either physical or electronic form, and we have approved all of the related stipulations for funding. The Dealer can also opt to repurchase Consumer Loans that have been assigned to us under the Portfolio Program, at their discretion, for a fee. For accounting purposes, the transactions described under the Portfolio Program are not considered to be loans to consumers. Instead, our accounting reflects that of a lender to the Dealer. The classification as a Dealer Loan for accounting purposes is primarily a result of (1) the Dealer’s financial interest in the Consumer Loan and (2) certain elements of our legal relationship with the Dealer. Purchase Program The Purchase Program differs from our Portfolio Program in that the Dealer receives a one-time payment from us at the time of assignment to purchase the Consumer Loan instead of a cash advance at the time of assignment and future Dealer Holdback payments. For accounting purposes, the transactions described under the Purchase Program are considered to be originated by the Dealer and then purchased by us. Program Enrollment Dealers may enroll in our Portfolio Program by (1) paying an up-front, one-time fee of $9,850 , or (2) agreeing to allow us to retain 50% of their first accelerated Dealer Holdback payment. Access to the Purchase Program is typically only granted to Dealers that meet one of the following: • received first accelerated Dealer Holdback payment under the Portfolio Program; • franchise dealership; or • independent dealership that meets certain criteria upon enrollment.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Business Segment Information We currently operate in one reportable segment which represents our core business of offering financing programs that enable Dealers to sell vehicles to consumers, regardless of their credit history. The consolidated financial statements reflect the financial results of our one reportable operating segment. Cash and Cash Equivalents Cash equivalents consist of readily marketable securities with original maturities at the date of acquisition of three months or less. As of June 30, 2017 and December 31, 2016 , we had $26.9 million and $14.3 million , respectively, in cash and cash equivalents that were not insured by the Federal Deposit Insurance Corporation (“FDIC”). Restricted Cash and Cash Equivalents Restricted cash and cash equivalents consist of cash pledged as collateral for secured financings and cash held in a trust for future vehicle service contract claims. As of June 30, 2017 and December 31, 2016 , we had $313.3 million and $224.1 million , respectively, in restricted cash and cash equivalents that were not insured by the FDIC. Restricted Securities Available for Sale Restricted securities available for sale consist of amounts held in a trust for future vehicle service contract claims. We determine the appropriate classification of our investments in debt securities at the time of purchase and reevaluate such determinations at each balance sheet date. Debt securities for which we do not have the intent or ability to hold to maturity are classified as available for sale, and stated at fair value with unrealized gains and losses, net of income taxes included in the determination of comprehensive income and reported as a component of shareholders’ equity. Loans Receivable and Allowance for Credit Losses Consumer Loan Assignment. For legal purposes, a Consumer Loan is considered to have been assigned to us after the following has occurred: • the consumer and Dealer have signed a Consumer Loan contract; and • we have received the executed Consumer Loan contract and supporting documentation in either physical or electronic form. For accounting and financial reporting purposes, a Consumer Loan is considered to have been assigned to us after the following has occurred: • the Consumer Loan has been legally assigned to us; and • we have made a funding decision and generally have provided funding to the Dealer in the form of either an advance under the Portfolio Program or one-time purchase payment under the Purchase Program. Portfolio Segments and Classes. We are considered to be a lender to our Dealers for Consumer Loans assigned under our Portfolio Program and a purchaser of Consumer Loans assigned under our Purchase Program. As a result, our Loan portfolio consists of two portfolio segments: Dealer Loans and Purchased Loans. Each portfolio segment is comprised of one class of Consumer Loan assignments, which is Consumer Loans originated by Dealers to finance purchases of vehicles and related ancillary products by consumers with impaired or limited credit histories. Dealer Loans . Amounts advanced to Dealers for Consumer Loans assigned under the Portfolio Program are recorded as Dealer Loans and are aggregated by Dealer for purposes of recognizing revenue and evaluating impairment. We account for Dealer Loans based on forecasted cash flows instead of contractual cash flows as we do not expect to collect all of the contractually specified amounts due to the credit quality of the underlying Consumer Loans. The outstanding balance of each Dealer Loan included in Loans receivable is comprised of the following: • the aggregate amount of all cash advances paid; • finance charges; • Dealer Holdback payments; • accelerated Dealer Holdback payments; and • recoveries. Less: • collections (net of certain collection costs); and • write-offs. An allowance for credit losses is maintained at an amount that reduces the net asset value (Dealer Loan balance less the allowance) to the value of forecasted future cash flows discounted at the yield established at the time of assignment. This allowance calculation is completed for each individual Dealer. Future cash flows are comprised of estimated future collections on the Consumer Loans, less any estimated Dealer Holdback payments. We write off Dealer Loans once there are no forecasted future cash flows on any of the associated Consumer Loans, which generally occurs 120 months after the last Consumer Loan assignment. Future collections on Dealer Loans are forecasted for each individual Dealer based on the historical performance of Consumer Loans with similar characteristics, adjusted for recent trends in payment patterns. Dealer Holdback is forecasted for each individual Dealer based on the expected future collections and current advance balance of each Dealer Loan. Cash flows from any individual Dealer Loan are often different than estimated cash flows at the time of assignment. If such difference is favorable, the difference is recognized prospectively into income over the remaining life of the Dealer Loan through a yield adjustment. If such difference is unfavorable, a provision for credit losses is recorded immediately as a current period expense and a corresponding allowance for credit losses is established. Because differences between estimated cash flows at the time of assignment and actual cash flows occur often, an allowance is required for a significant portion of our Dealer Loan portfolio. An allowance for credit losses does not necessarily indicate that a Dealer Loan is unprofitable, and seldom are cash flows from a Dealer Loan insufficient to repay the initial amounts advanced to the Dealer. Purchased Loans . Amounts paid to Dealers for Consumer Loans assigned under the Purchase Program are recorded as Purchased Loans and are aggregated into pools based on the month of purchase for purposes of recognizing revenue and evaluating impairment. We account for Purchased Loans based on forecasted cash flows instead of contractual cash flows as we do not expect to collect all of the contractually specified amounts due to the credit quality of the assigned Consumer Loans. The outstanding balance of each Purchased Loan pool included in Loans receivable is comprised of the following: • the aggregate amount of all amounts paid during the month of purchase to purchase Consumer Loans from Dealers; • finance charges; and • recoveries. Less: • collections (net of certain collection costs); and • write-offs. An allowance for credit losses is maintained at an amount that reduces the net asset value (Purchased Loan pool balance less the allowance) to the value of forecasted future cash flows discounted at the yield established at the time of assignment. This allowance calculation is completed for each individual monthly pool of Purchased Loans. Future cash flows are comprised of estimated future collections on the pool of Purchased Loans. We write off pools of Purchased Loans once there are no forecasted future cash flows on any of the Purchased Loans included in the pool, which generally occurs 120 months after the month of purchase. Future collections on Purchased Loans are forecasted for each individual pool based on the historical performance of Consumer Loans with similar characteristics, adjusted for recent trends in payment patterns. Cash flows from any individual pool of Purchased Loans are often different than estimated cash flows at the time of assignment. If such difference is favorable, the difference is recognized prospectively into income over the remaining life of the pool of Purchased Loans through a yield adjustment. If such difference is unfavorable, a provision for credit losses is recorded immediately as a current period expense and a corresponding allowance for credit losses is established. Credit Quality. Substantially all of the Consumer Loans assigned to us are made to individuals with impaired or limited credit histories or higher debt-to-income ratios than are permitted by traditional lenders. Consumer Loans made to these individuals generally entail a higher risk of delinquency, default and repossession and higher losses than loans made to consumers with better credit. Since most of our revenue and cash flows are generated from these Consumer Loans, our ability to accurately forecast Consumer Loan performance is critical to our business and financial results. At the time the Consumer Loan is submitted to us for assignment, we forecast future expected cash flows from the Consumer Loan. Based on these forecasts, an advance or one-time purchase payment is made to the related Dealer at a price designed to maximize economic profit, a non-GAAP financial measure that considers our return on capital, our cost of capital and the amount of capital invested. We monitor and evaluate the credit quality of Consumer Loans on a monthly basis by comparing our current forecasted collection rates to our initial expectations. We use a statistical model that considers a number of credit quality indicators to estimate the expected collection rate for each Consumer Loan at the time of assignment. The credit quality indicators considered in our model include attributes contained in the consumer’s credit bureau report, data contained in the consumer’s credit application, the structure of the proposed transaction, vehicle information and other factors. We continue to evaluate the expected collection rate of each Consumer Loan subsequent to assignment primarily through the monitoring of consumer payment behavior. Our evaluation becomes more accurate as the Consumer Loans age, as we use actual performance data in our forecast. Since all known, significant credit quality indicators have already been factored into our forecasts and pricing, we are not able to use any specific credit quality indicators to predict or explain variances in actual performance from our initial expectations. Any variances in performance from our initial expectations are the result of Consumer Loans performing differently than historical Consumer Loans with similar characteristics. We periodically adjust our statistical pricing model for new trends that we identify through our evaluation of these forecasted collection rate variances. When overall forecasted collection rates underperform our initial expectations, the decline in forecasted collections has a more adverse impact on the profitability of the Purchased Loans than on the profitability of the Dealer Loans. For Purchased Loans, the decline in forecasted collections is absorbed entirely by us. For Dealer Loans, the decline in the forecasted collections is substantially offset by a decline in forecasted payments of Dealer Holdback. Methodology Changes . For the three and six months ended June 30, 2017 and 2016 , we did not make any methodology changes for Loans that had a material impact on our financial statements. Reinsurance VSC Re Company (“VSC Re”), our wholly-owned subsidiary, is engaged in the business of reinsuring coverage under vehicle service contracts sold to consumers by Dealers on vehicles financed by us. VSC Re currently reinsures vehicle service contracts that are offered through one of our third party providers. Vehicle service contract premiums, which represent the selling price of the vehicle service contract to the consumer, less fees and certain administrative costs, are contributed to a trust account controlled by VSC Re. These premiums are used to fund claims covered under the vehicle service contracts. VSC Re is a bankruptcy remote entity. As such, our exposure to fund claims is limited to the trust assets controlled by VSC Re and our net investment in VSC Re. Premiums from the reinsurance of vehicle service contracts are recognized over the life of the policy in proportion to expected costs of servicing those contracts. Expected costs are determined based on our historical claims experience. Claims are expensed through a provision for claims in the period the claim was incurred. Capitalized acquisition costs are comprised of premium taxes and are amortized as general and administrative expense over the life of the contracts in proportion to premiums earned. We have consolidated the trust within our financial statements based on our determination of the following: • We have a variable interest in the trust. We have a residual interest in the assets of the trust, which is variable in nature, given that it increases or decreases based upon the actual loss experience of the related service contracts. In addition, VSC Re is required to absorb any losses in excess of the trust's assets. • The trust is a variable interest entity. The trust has insufficient equity at risk as no parties to the trust were required to contribute assets that provide them with any ownership interest. • We are the primary beneficiary of the trust. We control the amount of premium written and placed in the trust through Consumer Loan assignments under our Programs, which is the activity that most significantly impacts the economic performance of the trust. We have the right to receive benefits from the trust that could potentially be significant. In addition, VSC Re has the obligation to absorb losses of the trust that could potentially be significant. New Accounting Updates Adopted During the Current Year Improvements to Employee Share-Based Payment Accounting. In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, which simplifies the accounting for share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and the classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years, and interim periods, beginning after December 15, 2016, with early adoption permitted. The adoption of ASU 2016-09 on January 1, 2017 changed where we recognize excess tax benefits and deficiencies from stock-based compensation plans in our consolidated financial statements on a prospective basis. We receive a tax deduction upon the vesting of restricted stock and the conversion of restricted stock units to common stock based on the fair value of the shares. The amount that this tax deduction differs from the grant-date fair value that was recognized as stock-based compensation expense is referred to as an excess tax benefit or deficiency. For periods prior to adoption, these excess tax benefits or deficiencies were recognized in paid-in capital in our consolidated balance sheets and reported as a financing activity in our consolidated statements of cash flows. Upon adoption, these excess tax benefits or deficiencies are recognized in provision for income taxes in our consolidated statements of income and reported as an operating activity in our consolidated statements of cash flows. As a result of the adoption, excess tax benefits of $2.5 million decreased our provision for income taxes, increased our net cash provided by operating activities and decreased our net cash provided by financing activities for the six months ended June 30, 2017. New Accounting Updates Not Yet Adopted Restricted Cash. In November 2016, the FASB issued ASU 2016-18, which amends Topic 230 (Statement of Cash Flows) and requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is intended to reduce diversity in practice in how restricted cash or restricted cash equivalents are presented and classified in the statement of cash flows. ASU 2016-18 is effective for fiscal years, and interim periods, beginning after December 15, 2017, with early adoption permitted. The standard requires application using a retrospective transition method. The adoption of ASU 2016-18 on January 1, 2018 will change the presentation and classification of restricted cash and restricted cash equivalents in our consolidated statements of cash flows. Measurement of Credit Losses on Financial Instruments. In June 2016, the FASB issued ASU 2016-13, which includes an impairment model (known as the current expected credit loss (CECL) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses. ASU 2016-13 is effective for fiscal years, and interim periods, beginning after December 15, 2019. Early application is permitted for fiscal years, and interim periods, beginning after December 15, 2018. While we continue to assess the impact of ASU 2016-13, based on our preliminary assessment, we believe the adoption will have a material impact on our consolidated financial statements and related disclosures. Revenue from Contracts with Customers. In May 2014, the FASB issued ASU 2014-09, which supersedes the revenue recognition requirements Topic 605 (Revenue Recognition), and most industry-specific guidance. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). In August 2015, the FASB issued ASU 2015-14 to defer the effective date of ASU 2014-09 by one year to fiscal years beginning after December 15, 2017. ASU 2015-14 also permits early adoption of ASU 2014-09, but not before the original effective date, which was for fiscal years beginning after December 15, 2016. We plan on adopting ASU 2014-09, as amended by ASU 2015-14, on January 1, 2018 using the modified retrospective method and do not believe the adoption will have a material impact on our consolidated financial statements and related disclosures. Given that the guidance is not applicable to our finance charges and premiums earned sources of revenue, our assessment has focused on our other income source of revenue. Based on our assessment completed to date, we do not expect the adoption of ASU 2014-09, as amended by ASU 2015-14, to have a material impact on the timing of revenue recognition and financial statement presentation of our other income source of revenue. Leases. In February 2016, the FASB issued ASU 2016-02, which requires lessees to recognize a right-of-use asset and related lease liability for leases classified as operating leases at the commencement date that have lease terms of more than 12 months. This ASU retains the classification distinction between finance leases and operating leases. ASU 2016-02 is effective for fiscal years, and interim periods, beginning after December 15, 2018. Early application is permitted, but we have not yet adopted ASU 2016-02. We are currently assessing the impact the adoption of ASU 2016-02 will have on our consolidated financial statements and related disclosures.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate their value. Cash and Cash Equivalents and Restricted Cash and Cash Equivalents. The carrying amounts approximate their fair value due to the short maturity of these instruments. Restricted Securities Available for Sale. The fair value of U.S. Government and agency securities and corporate bonds is based on quoted market values in active markets. For asset-backed securities and mortgage-backed securities, we use model-based valuation techniques for which all significant assumptions are observable in the market. Loans Receivable, net. The fair value is determined by calculating the present value of future net cash flows estimated by us utilizing a discount rate comparable with the rate used to calculate our allowance for credit losses. Revolving Secured Line of Credit. The fair value is determined by calculating the present value of the debt instrument based on current rates for debt with a similar risk profile and maturity. Secured Financing. The fair value of our asset-backed secured financings ("Term ABS") is determined using quoted market prices; however, these instruments trade in a market with a low trading volume. For our warehouse facilities, the fair values are determined by calculating the present value of each debt instrument based on current rates for debt with similar risk profiles and maturities. Senior Notes. The fair value is determined using quoted market prices in an active market. A comparison of the carrying value and estimated fair value of these financial instruments is as follows: (In millions) As of June 30, 2017 As of December 31, 2016 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets Cash and cash equivalents $ 27.2 $ 27.2 $ 14.6 $ 14.6 Restricted cash and cash equivalents 313.9 313.9 224.7 224.7 Restricted securities available for sale 46.5 46.5 45.3 45.3 Loans receivable, net 4,283.6 4,361.0 3,886.6 3,955.9 Liabilities Secured financing $ 2,472.3 $ 2,489.3 $ 2,062.4 $ 2,072.0 Senior notes 542.1 567.1 541.3 560.5 Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. We group assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1 Valuation is based upon quoted prices for identical instruments traded in active markets. Level 2 Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3 Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates or assumptions that market participants would use in pricing the asset or liability. The following table provides the level of measurement used to determine the fair value for each of our financial instruments: (In millions) As of June 30, 2017 Level 1 Level 2 Level 3 Total Fair Value Assets Cash and cash equivalents $ 27.2 $ — $ — $ 27.2 Restricted cash and cash equivalents 313.9 — — 313.9 Restricted securities available for sale (1) 37.5 9.0 — 46.5 Loans receivable, net — — 4,361.0 4,361.0 Liabilities Secured financing $ — $ 2,489.3 $ — $ 2,489.3 Senior notes 567.1 — — 567.1 (In millions) As of December 31, 2016 Level 1 Level 2 Level 3 Total Fair Value Assets Cash and cash equivalents $ 14.6 $ — $ — $ 14.6 Restricted cash and cash equivalents 224.7 — — 224.7 Restricted securities available for sale (1) 37.1 8.2 — 45.3 Loans receivable, net — — 3,955.9 3,955.9 Liabilities Secured financing $ — $ 2,072.0 $ — $ 2,072.0 Senior notes 560.5 — — 560.5 (1) Measured and recorded at fair value on a recurring basis.

Restricted Securities Available

Restricted Securities Available for Sale	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Restricted Securities Available for Sale	RESTRICTED SECURITIES AVAILABLE FOR SALE Restricted securities available for sale consist of the following: (In millions) As of June 30, 2017 Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government and agency securities $ 18.8 $ — $ (0.1 ) $ 18.7 Corporate bonds 18.7 0.1 — 18.8 Asset-backed securities 6.4 — — 6.4 Mortgage-backed securities 2.6 — — 2.6 Total restricted securities available for sale $ 46.5 $ 0.1 $ (0.1 ) $ 46.5 (In millions) As of December 31, 2016 Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government and agency securities $ 20.4 $ — $ (0.1 ) $ 20.3 Corporate bonds 16.9 0.1 (0.2 ) 16.8 Asset-backed securities 5.0 — — 5.0 Mortgage-backed securities 3.2 — — 3.2 Total restricted securities available for sale $ 45.5 $ 0.1 $ (0.3 ) $ 45.3 The fair value and gross unrealized losses for restricted securities available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are as follows: (In millions) Securities Available for Sale with Gross Unrealized Losses as of June 30, 2017 Less than 12 Months 12 Months or More Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Total Estimated Fair Value Total Gross Unrealized Losses U.S. Government and agency securities $ 13.4 $ (0.1 ) $ — $ — $ 13.4 $ (0.1 ) Corporate bonds 7.3 — — — 7.3 — Asset-backed securities 3.0 — — — 3.0 — Mortgage-backed securities 1.7 — — — 1.7 — Total restricted securities available for sale $ 25.4 $ (0.1 ) $ — $ — $ 25.4 $ (0.1 ) (In millions) Securities Available for Sale with Gross Unrealized Losses as of December 31, 2016 Less than 12 Months 12 Months or More Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Total Estimated Fair Value Total Gross Unrealized Losses U.S. Government and agency securities $ 16.4 $ (0.1 ) $ — $ — $ 16.4 $ (0.1 ) Corporate bonds 11.8 (0.2 ) — — 11.8 (0.2 ) Asset-backed securities 2.8 — — — 2.8 — Mortgage-backed securities 2.4 — — — 2.4 — Total restricted securities available for sale $ 33.4 $ (0.3 ) $ — $ — $ 33.4 $ (0.3 ) The cost and estimated fair values of debt securities by contractual maturity were as follows (securities with multiple maturity dates are classified in the period of final maturity). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. (In millions) As of June 30, 2017 December 31, 2016 Contractual Maturity Cost Estimated Fair Value Cost Estimated Fair Value Within one year $ 0.8 $ 0.8 $ 1.6 $ 1.6 Over one year to five years 39.7 39.7 39.3 39.1 Over five years to ten years 3.5 3.5 2.2 2.2 Over ten years 2.5 2.5 2.4 2.4 Total restricted securities available for sale $ 46.5 $ 46.5 $ 45.5 $ 45.3

Loans Receivable

Loans Receivable	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Loans Receivable	LOANS RECEIVABLE Loans receivable consists of the following: (In millions) As of June 30, 2017 Dealer Loans Purchased Loans Total Loans receivable $ 3,385.3 $ 1,252.4 $ 4,637.7 Allowance for credit losses (336.9 ) (17.2 ) (354.1 ) Loans receivable, net $ 3,048.4 $ 1,235.2 $ 4,283.6 (In millions) As of December 31, 2016 Dealer Loans Purchased Loans Total Loans receivable $ 3,209.0 $ 998.0 $ 4,207.0 Allowance for credit losses (309.3 ) (11.1 ) (320.4 ) Loans receivable, net $ 2,899.7 $ 986.9 $ 3,886.6 A summary of changes in Loans receivable is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 3,326.5 $ 1,147.5 $ 4,474.0 New Consumer Loan assignments (1) 456.3 215.5 671.8 Principal collected on Loans receivable (438.2 ) (111.1 ) (549.3 ) Accelerated Dealer Holdback payments 13.4 — 13.4 Dealer Holdback payments 33.5 — 33.5 Transfers (2) (1.1 ) 1.1 — Write-offs (5.5 ) (0.7 ) (6.2 ) Recoveries (3) 0.4 0.1 0.5 Balance, end of period $ 3,385.3 $ 1,252.4 $ 4,637.7 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 2,985.7 $ 640.5 $ 3,626.2 New Consumer Loan assignments (1) 438.0 189.4 627.4 Principal collected on Loans receivable (420.5 ) (68.1 ) (488.6 ) Accelerated Dealer Holdback payments 14.9 — 14.9 Dealer Holdback payments 35.9 — 35.9 Transfers (2) (1.1 ) 1.1 — Write-offs (4.1 ) (0.1 ) (4.2 ) Recoveries (3) 0.4 — 0.4 Balance, end of period $ 3,049.2 $ 762.8 $ 3,812.0 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 3,209.0 $ 998.0 $ 4,207.0 New Consumer Loan assignments (1) 993.2 470.1 1,463.3 Principal collected on Loans receivable (899.2 ) (217.1 ) (1,116.3 ) Accelerated Dealer Holdback payments 23.6 — 23.6 Dealer Holdback payments 68.7 — 68.7 Transfers (2) (2.2 ) 2.2 — Write-offs (8.5 ) (0.9 ) (9.4 ) Recoveries (3) 0.7 0.1 0.8 Balance, end of period $ 3,385.3 $ 1,252.4 $ 4,637.7 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 2,823.4 $ 521.7 $ 3,345.1 New Consumer Loan assignments (1) 1,000.7 370.8 1,371.5 Principal collected on Loans receivable (871.3 ) (132.1 ) (1,003.4 ) Accelerated Dealer Holdback payments 29.7 — 29.7 Dealer Holdback payments 75.8 — 75.8 Transfers (2) (2.5 ) 2.5 — Write-offs (7.3 ) (0.1 ) (7.4 ) Recoveries (3) 0.7 — 0.7 Balance, end of period $ 3,049.2 $ 762.8 $ 3,812.0 (1) The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. (2) Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance to Purchased Loans in the period this forfeiture occurs. (3) Represents collections received on previously written off Loans. Contractual net cash flows are comprised of the contractual repayments of the underlying Consumer Loans for Dealer and Purchased Loans, less the related Dealer Holdback payments for Dealer Loans. The difference between the contractual net cash flows and the expected net cash flows is referred to as the nonaccretable difference. This difference is neither accreted into income nor recorded in our balance sheets. We do not believe that the contractual net cash flows of our Loan portfolio are relevant in assessing our financial position. We are contractually owed repayments on many Consumer Loans, primarily those older than 120 months , where we are not forecasting any future net cash flows. The excess of expected net cash flows over the outstanding balance of Loans receivable, net is referred to as the accretable yield and is recognized on a level-yield basis as finance charge income over the remaining lives of the Loans. A summary of changes in the accretable yield is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 1,028.1 $ 414.6 $ 1,442.7 New Consumer Loan assignments (1) 186.8 88.5 275.3 Accretion (2) (193.0 ) (60.9 ) (253.9 ) Provision for credit losses 18.2 3.6 21.8 Forecast changes (1.5 ) 10.3 8.8 Transfers (3) (0.2 ) 0.3 0.1 Balance, end of period $ 1,038.4 $ 456.4 $ 1,494.8 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 946.6 $ 238.6 $ 1,185.2 New Consumer Loan assignments (1) 183.6 70.3 253.9 Accretion (2) (180.4 ) (37.0 ) (217.4 ) Provision for credit losses 17.9 — 17.9 Forecast changes (3.9 ) 10.4 6.5 Transfers (3) (0.6 ) 1.0 0.4 Balance, end of period $ 963.2 $ 283.3 $ 1,246.5 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 982.6 $ 348.1 $ 1,330.7 New Consumer Loan assignments (1) 406.5 191.9 598.4 Accretion (2) (380.8 ) (113.3 ) (494.1 ) Provision for credit losses 35.4 6.9 42.3 Forecast changes (4.9 ) 21.8 16.9 Transfers (3) (0.4 ) 1.0 0.6 Balance, end of period $ 1,038.4 $ 456.4 $ 1,494.8 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 874.2 $ 198.6 $ 1,072.8 New Consumer Loan assignments (1) 417.7 137.6 555.3 Accretion (2) (354.1 ) (68.4 ) (422.5 ) Provision for credit losses 39.7 0.3 40.0 Forecast changes (13.5 ) 13.3 (0.2 ) Transfers (3) (0.8 ) 1.9 1.1 Balance, end of period $ 963.2 $ 283.3 $ 1,246.5 (1) The Dealer Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related advances paid to Dealers. The Purchased Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Purchase Program, less the related one-time payments made to Dealers. (2) Represents finance charges excluding the amortization of deferred direct origination costs for Dealer Loans. (3) Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance and related expected future net cash flows to Purchased Loans in the period this forfeiture occurs. Additional information related to new Consumer Loan assignments is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 726.0 $ 464.9 $ 1,190.9 Expected net cash flows at the time of assignment (2) 643.1 304.0 947.1 Fair value at the time of assignment (3) 456.3 215.5 671.8 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 698.6 $ 382.9 $ 1,081.5 Expected net cash flows at the time of assignment (2) 621.6 259.7 881.3 Fair value at the time of assignment (3) 438.0 189.4 627.4 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 1,580.5 $ 1,016.0 $ 2,596.5 Expected net cash flows at the time of assignment (2) 1,399.7 662.0 2,061.7 Fair value at the time of assignment (3) 993.2 470.1 1,463.3 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 1,588.7 $ 749.5 $ 2,338.2 Expected net cash flows at the time of assignment (2) 1,418.4 508.4 1,926.8 Fair value at the time of assignment (3) 1,000.7 370.8 1,371.5 (1) The Dealer Loans amount represents the repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related Dealer Holdback payments that we would be required to make if we collected all of the contractual repayments. The Purchased Loans amount represents the repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under our Purchase Program. (2) The Dealer Loans amount represents the repayments that we expected to collect at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related Dealer Holdback payments that we expected to make. The Purchased Loans amount represents the repayments that we expected to collect at the time of assignment on Consumer Loans assigned under our Purchase Program. (3) The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. Credit Quality We monitor and evaluate the credit quality of Consumer Loans assigned under our Portfolio and Purchase Programs on a monthly basis by comparing our current forecasted collection rates to our initial expectations. For additional information regarding credit quality, see Note 3 to the consolidated financial statements. The following table compares our forecast of Consumer Loan collection rates as of June 30, 2017 , with the forecasts as of March 31, 2017, December 31, 2016 and at the time of assignment, segmented by year of assignment: Forecasted Collection Percentage as of (1) Current Forecast Variance from Consumer Loan Assignment Year June 30, 2017 March 31, 2017 December 31, 2016 Initial Forecast March 31, 2017 December 31, 2016 Initial Forecast 2008 70.5 % 70.4 % 70.4 % 69.7 % 0.1 % 0.1 % 0.8 % 2009 79.5 % 79.4 % 79.4 % 71.9 % 0.1 % 0.1 % 7.6 % 2010 77.6 % 77.6 % 77.6 % 73.6 % 0.0 % 0.0 % 4.0 % 2011 74.8 % 74.7 % 74.7 % 72.5 % 0.1 % 0.1 % 2.3 % 2012 73.8 % 73.8 % 73.7 % 71.4 % 0.0 % 0.1 % 2.4 % 2013 73.5 % 73.4 % 73.4 % 72.0 % 0.1 % 0.1 % 1.5 % 2014 71.7 % 71.7 % 71.8 % 71.8 % 0.0 % -0.1 % -0.1 % 2015 65.7 % 65.8 % 66.1 % 67.7 % -0.1 % -0.4 % -2.0 % 2016 65.1 % 65.3 % 65.1 % 65.4 % -0.2 % 0.0 % -0.3 % 2017 (2) 65.5 % 64.9 % — 64.2 % 0.6 % — 1.3 % (1) Represents the total forecasted collections we expect to collect on the Consumer Loans as a percentage of the repayments that we were contractually owed on the Consumer Loans at the time of assignment. Contractual repayments include both principal and interest. Forecasted collection rates are negatively impacted by canceled Consumer Loans as the contractual amount owed is not removed from the denominator for purposes of computing forecasted collection rates in the table. (2) The forecasted collection rate for 2017 Consumer Loans as of June 30, 2017 includes both Consumer Loans that were in our portfolio as of March 31, 2017 and Consumer Loans assigned during the most recent quarter. The following table provides forecasted collection rates for each of these segments: Forecasted Collection Percentage as of Current Forecast Variance from 2017 Consumer Loan Assignment Period June 30, 2017 March 31, 2017 Initial Forecast March 31, 2017 Initial Forecast January 1, 2017 through March 31, 2017 65.5 % 64.9 % 64.0 % 0.6 % 1.5 % April 1, 2017 through June 30, 2017 65.4 % — 64.4 % — 1.0 % Consumer Loans assigned in 2009 through 2013 and 2017 have yielded forecasted collection results materially better than our initial estimates, while Consumer Loans assigned in 2015 have yielded forecasted collection results materially worse than our initial estimates. For Consumer Loans assigned in 2008, 2014 and 2016, actual results have been close to our initial estimates. For the three months ended June 30, 2017 , forecasted collection rates improved for Consumer Loans assigned in 2017, declined for Consumer Loans assigned in 2016 and were generally consistent with expectations at the start of the period for all other assignment years presented. For the six months ended June 30, 2017 , forecasted collection rates improved for Consumer Loans assigned in 2017, declined for Consumer Loans assigned in 2015 and were generally consistent with expectations at the start of the period for all other assignment years presented. Advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program are aggregated into pools for purposes of recognizing revenue and evaluating impairment. As a result of this aggregation, we are not able to segment the carrying amounts of the majority of our Loan portfolio by year of assignment. We are able to segment our Loan portfolio by the performance of the Loan pools. Performance considers both the amount and timing of expected net cash flows and is measured by comparing the balance of the Loan pool to the discounted value of the expected future net cash flows of each Loan pool using the yield established at the time of assignment. The following table segments our Loan portfolio by the performance of the Loan pools: (In millions) As of June 30, 2017 Loan Pool Performance Meets or Exceeds Initial Estimates Loan Pool Performance Less than Initial Estimates Dealer Loans Purchased Loans Total Dealer Loans Purchased Loans Total Loans receivable $ 1,104.6 $ 685.0 $ 1,789.6 $ 2,280.7 $ 567.4 $ 2,848.1 Allowance for credit losses — — — (336.9 ) (17.2 ) (354.1 ) Loans receivable, net $ 1,104.6 $ 685.0 $ 1,789.6 $ 1,943.8 $ 550.2 $ 2,494.0 (In millions) As of December 31, 2016 Loan Pool Performance Meets or Exceeds Initial Estimates Loan Pool Performance Less than Initial Estimates Dealer Loans Purchased Loans Total Dealer Loans Purchased Loans Total Loans receivable $ 1,002.2 $ 705.8 $ 1,708.0 $ 2,206.8 $ 292.2 $ 2,499.0 Allowance for credit losses — — — (309.3 ) (11.1 ) (320.4 ) Loans receivable, net $ 1,002.2 $ 705.8 $ 1,708.0 $ 1,897.5 $ 281.1 $ 2,178.6 A summary of changes in the allowance for credit losses is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 323.8 $ 14.2 $ 338.0 Provision for credit losses 18.2 3.6 21.8 Write-offs (5.5 ) (0.7 ) (6.2 ) Recoveries (1) 0.4 0.1 0.5 Balance, end of period $ 336.9 $ 17.2 $ 354.1 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 254.0 $ 8.8 $ 262.8 Provision for credit losses 17.9 — 17.9 Write-offs (4.1 ) (0.1 ) (4.2 ) Recoveries (1) 0.4 — 0.4 Balance, end of period $ 268.2 $ 8.7 $ 276.9 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 309.3 $ 11.1 $ 320.4 Provision for credit losses 35.4 6.9 42.3 Write-offs (8.5 ) (0.9 ) (9.4 ) Recoveries (1) 0.7 0.1 0.8 Balance, end of period $ 336.9 $ 17.2 $ 354.1 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 235.1 $ 8.5 $ 243.6 Provision for credit losses 39.7 0.3 40.0 Write-offs (7.3 ) (0.1 ) (7.4 ) Recoveries (1) 0.7 — 0.7 Balance, end of period $ 268.2 $ 8.7 $ 276.9 (1) Represents collections received on previously written off Loans.

Reinsurance Reinsurance (Notes)

Reinsurance Reinsurance (Notes)	6 Months Ended
	Jun. 30, 2017
Insurance [Abstract]
Reinsurance [Text Block]	REINSURANCE A summary of reinsurance activity is as follows: (In millions) For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Net assumed written premiums $ 9.6 $ 9.0 $ 21.9 $ 20.9 Net premiums earned 10.5 10.9 20.6 21.7 Provision for claims 6.1 7.0 12.1 13.8 Amortization of capitalized acquisition costs 0.2 0.3 0.5 0.5 The trust assets and related reinsurance liabilities are as follows: (In millions) As of Balance Sheet location June 30, 2017 December 31, 2016 Trust assets Restricted cash and cash equivalents $ 0.6 $ 0.5 Trust assets Restricted securities available for sale 46.5 45.3 Unearned premium Accounts payable and accrued liabilities 34.1 32.8 Claims reserve (1) Accounts payable and accrued liabilities 1.2 1.0 (1) The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.

Debt

Debt	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt	DEBT Debt consists of the following: (In millions) As of June 30, 2017 Principal Outstanding Unamortized Debt Issuance Costs Unamortized Discount Carrying Amount Secured financing (1) $ 2,485.2 $ (12.9 ) $ — $ 2,472.3 Senior notes 550.0 (6.5 ) (1.4 ) 542.1 Total debt $ 3,035.2 $ (19.4 ) $ (1.4 ) $ 3,014.4 (In millions) As of December 31, 2016 Principal Outstanding Unamortized Debt Issuance Costs Unamortized Discount Carrying Amount Secured financing (1) $ 2,072.1 $ (9.7 ) $ — $ 2,062.4 Senior notes 550.0 (7.1 ) (1.6 ) 541.3 Total debt $ 2,622.1 $ (16.8 ) $ (1.6 ) $ 2,603.7 (1) Warehouse facilities and Term ABS. General information for each of our financing transactions in place as of June 30, 2017 is as follows: (Dollars in millions) Financings Wholly-owned Subsidiary Maturity Date Financing Amount Interest Rate as of Revolving Secured Line of Credit n/a 06/22/2020 $ 345.0 (1) At our option, either LIBOR plus 187.5 basis points or the prime rate plus 87.5 basis points Warehouse Facility II (2) CAC Warehouse Funding Corp. II 06/23/2019 (4) $ 400.0 LIBOR plus 225 basis points (3) Warehouse Facility IV (2) CAC Warehouse Funding LLC IV 04/30/2020 (4) $ 100.0 LIBOR plus 225 basis points (3) Warehouse Facility V (2) CAC Warehouse Funding LLC V 08/18/2019 (5) $ 100.0 LIBOR plus 225 basis points (3) Warehouse Facility VI (2) CAC Warehouse Funding LLC VI 09/30/2018 (4) $ 75.0 LIBOR plus 200 basis points Term ABS 2014-2 (2) Credit Acceptance Funding LLC 2014-2 09/15/2016 (4) $ 349.0 Fixed rate Term ABS 2015-1 (2) Credit Acceptance Funding LLC 2015-1 01/16/2017 (4) $ 300.6 Fixed rate Term ABS 2015-2 (2) Credit Acceptance Funding LLC 2015-2 08/15/2017 (4) $ 300.2 Fixed rate Term ABS 2016-1 (2) Credit Acceptance Funding LLC 2016-1 02/15/2018 (4) $ 385.0 LIBOR plus 195 basis points (3) Term ABS 2016-2 (2) Credit Acceptance Funding LLC 2016-2 05/15/2018 (4) $ 350.2 Fixed rate Term ABS 2016-3 (2) Credit Acceptance Funding LLC 2016-3 10/15/2018 (4) $ 350.0 Fixed rate Term ABS 2017-1 (2) Credit Acceptance Funding LLC 2017-1 02/15/2019 (4) $ 350.0 Fixed rate Term ABS 2017-2 (2) Credit Acceptance Funding LLC 2017-2 06/17/2019 (4) $ 450.0 Fixed rate 2021 Senior Notes n/a 02/15/2021 $ 300.0 Fixed rate 2023 Senior Notes n/a 03/15/2023 $ 250.0 Fixed rate (1) The amount of the facility will decrease to $300.0 million on June 22, 2019. (2) Financing made available only to a specified subsidiary of the Company. (3) Interest rate cap agreements are in place to limit the exposure to increasing interest rates. (4) Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets. (5) Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on August 18, 2021 will be due on that date. Additional information related to the amounts outstanding on each facility is as follows: (In millions) For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Revolving Secured Line of Credit Maximum outstanding principal balance $ 276.7 $ 123.7 $ 276.7 $ 186.4 Average outstanding principal balance 178.8 22.2 120.9 39.4 Warehouse Facility II Maximum outstanding principal balance $ 263.4 $ 200.1 $ 263.4 $ 200.1 Average outstanding principal balance 5.8 6.6 5.1 5.5 Warehouse Facility IV Maximum outstanding principal balance $ 12.0 $ 12.0 $ 12.0 $ 12.0 Average outstanding principal balance 11.6 12.0 11.8 12.0 Warehouse Facility V Maximum outstanding principal balance $ 100.0 $ 100.0 $ 100.0 $ 100.0 Average outstanding principal balance 28.9 3.3 15.6 2.1 Warehouse Facility VI Maximum outstanding principal balance $ 75.0 $ 49.9 $ 75.0 $ 49.9 Average outstanding principal balance 28.4 1.6 14.8 6.0 (Dollars in millions) As of June 30, 2017 December 31, 2016 Revolving Secured Line of Credit Principal balance outstanding $ — $ — Amount available for borrowing (1) 345.0 310.0 Interest rate — % — % Warehouse Facility II Principal balance outstanding $ — $ — Amount available for borrowing (1) 400.0 400.0 Loans pledged as collateral — — Restricted cash and cash equivalents pledged as collateral 2.7 1.5 Interest rate — % — % Warehouse Facility IV Principal balance outstanding $ — $ 12.0 Amount available for borrowing (1) 100.0 63.0 Loans pledged as collateral — 23.0 Restricted cash and cash equivalents pledged as collateral 0.1 0.9 Interest rate — % 2.77 % Warehouse Facility V Principal balance outstanding $ — $ — Amount available for borrowing (1) 100.0 100.0 Loans pledged as collateral — — Restricted cash and cash equivalents pledged as collateral 1.1 1.0 Interest rate — % — % Warehouse Facility VI Principal balance outstanding $ — $ — Amount available for borrowing (1) 75.0 75.0 Loans pledged as collateral — — Restricted cash and cash equivalents pledged as collateral 0.8 0.1 Interest rate — % — % Term ABS 2014-1 Principal balance outstanding $ — $ 106.5 Loans pledged as collateral — 307.2 Restricted cash and cash equivalents pledged as collateral — 28.3 Interest rate — % 2.02 % Term ABS 2014-2 Principal balance outstanding $ 112.7 $ 267.6 Loans pledged as collateral 328.0 413.9 Restricted cash and cash equivalents pledged as collateral 33.6 34.9 Interest rate 2.41 % 2.10 % Term ABS 2015-1 Principal balance outstanding $ 187.1 $ 300.6 Loans pledged as collateral 305.4 374.5 Restricted cash and cash equivalents pledged as collateral 29.4 29.6 Interest rate 2.41 % 2.26 % Term ABS 2015-2 Principal balance outstanding $ 300.2 $ 300.2 Loans pledged as collateral 364.4 372.6 Restricted cash and cash equivalents pledged as collateral 31.3 28.1 Interest rate 2.63 % 2.63 % Term ABS 2016-1 Principal balance outstanding $ 385.0 $ 385.0 Loans pledged as collateral 463.3 474.0 Restricted cash and cash equivalents pledged as collateral 39.1 34.8 Interest rate 3.11 % 2.65 % Term ABS 2016-2 Principal balance outstanding $ 350.2 $ 350.2 Loans pledged as collateral 422.1 490.7 Restricted cash and cash equivalents pledged as collateral 35.3 34.4 Interest rate 2.83 % 2.83 % Term ABS 2016-3 Principal balance outstanding $ 350.0 $ 350.0 Loans pledged as collateral 448.4 489.6 Restricted cash and cash equivalents pledged as collateral 34.4 30.6 Interest rate 2.53 % 2.53 % Term ABS 2017-1 Principal balance outstanding $ 350.0 $ — Loans pledged as collateral 456.3 — Restricted cash and cash equivalents pledged as collateral 34.2 — Interest rate 2.78 % — % Term ABS 2017-2 Principal balance outstanding $ 450.0 $ — Loans pledged as collateral 572.9 — Restricted cash and cash equivalents pledged as collateral 71.3 — Interest rate 2.72 % — % 2021 Senior Notes Principal balance outstanding $ 300.0 $ 300.0 Interest rate 6.125 % 6.125 % 2023 Senior Notes Principal balance outstanding $ 250.0 $ 250.0 Interest rate 7.375 % 7.375 % (1) Availability may be limited by the amount of assets pledged as collateral. Revolving Secured Line of Credit Facility We have a $345.0 million revolving secured line of credit facility with a commercial bank syndicate. The amount of the facility will decrease to $300.0 million on June 22, 2019. Borrowings under the revolving secured line of credit facility, including any letters of credit issued under the facility, are subject to a borrowing-base limitation. This limitation equals 80% of the net book value of Loans, less a hedging reserve (not exceeding $1.0 million ), and the amount of other debt secured by the collateral which secures the revolving secured line of credit facility. Borrowings under the revolving secured line of credit facility agreement are secured by a lien on most of our assets. Warehouse Facilities We have four Warehouse facilities with total borrowing capacity of $675.0 million . Each of the facilities are with different lenders. Under each Warehouse facility, we can contribute Loans to our wholly-owned subsidiaries in return for cash and equity in each subsidiary. In turn, each subsidiary pledges the Loans as collateral to lenders to secure financing that will fund the cash portion of the purchase price of the Loans. The financing provided to each subsidiary under the applicable facility is limited to the lesser of 80% of the net book value of the contributed Loans plus the restricted cash and cash equivalents pledged as collateral on such Loans or the facility limit. The financings create indebtedness for which the subsidiaries are liable and which is secured by all the assets of each subsidiary. Such indebtedness is non-recourse to us, even though we are consolidated for financial reporting purposes with the subsidiaries. Because the subsidiaries are organized as legal entities separate from us, their assets (including the contributed Loans) are not available to our creditors. The subsidiaries pay us a monthly servicing fee equal to 6% of the collections received with respect to the contributed Loans. The fee is paid out of the collections. Except for the servicing fee and holdback payments due to Dealers, if a facility is amortizing, we do not have any rights in any portion of such collections until all outstanding principal, accrued and unpaid interest, fees and other related costs have been paid in full. If a facility is not amortizing, the applicable subsidiary may be entitled to retain a portion of such collections provided that the borrowing base requirements of the facility are satisfied. Term ABS Financings We have wholly-owned subsidiaries (the “Funding LLCs”) that have completed secured financing transactions with qualified institutional investors or lenders. In connection with these transactions, we contributed Loans on an arms-length basis to each Funding LLC for cash and the sole membership interest in that Funding LLC. In turn, each Funding LLC, other than that of Term ABS 2016-1, contributed the Loans to a respective trust that issued notes to qualified institutional investors. The Funding LLC for the Term ABS 2016-1 transaction pledged the Loans to lenders. The Term ABS 2014-2, 2015-1, 2015-2, 2016-2, 2016-3, 2017-1 and 2017-2 transactions each consist of three classes of notes. The Class C Notes for Term ABS 2014-2 do not bear interest and have been retained by us. Each financing at the time of issuance has a specified revolving period during which we may be required, and are likely, to contribute additional Loans to each Funding LLC. If applicable, each Funding LLC will then contribute the Loans to their respective trust. At the end of the revolving period, the debt outstanding under each financing will begin to amortize. The financings create indebtedness for which the trusts or Funding LLC are liable and which is secured by all the assets of each trust or Funding LLC. Such indebtedness is non-recourse to us, even though we are consolidated for financial reporting purposes with the trusts and the Funding LLCs. Because the Funding LLCs are organized as legal entities separate from us, their assets (including the contributed Loans) are not available to our creditors. We receive a monthly servicing fee on each financing equal to 6% of the collections received with respect to the contributed Loans. The fee is paid out of the collections. Except for the servicing fee and Dealer Holdback payments due to Dealers, if a facility is amortizing, we do not have any rights in any portion of such collections until all outstanding principal, accrued and unpaid interest, fees and other related costs have been paid in full. If a facility is not amortizing, the applicable subsidiary may be entitled to retain a portion of such collections provided that the borrowing base requirements of the facility are satisfied. However, in our capacity as servicer of the Loans, we do have a limited right to exercise a “clean-up call” option to purchase Loans from the Funding LLCs and/or the trusts under certain specified circumstances. For those Funding LLCs with a trust, when the trust’s underlying indebtedness is paid in full, either through collections or through a prepayment of the indebtedness, the trust is to pay any remaining collections over to its Funding LLC as the sole beneficiary of the trust. For all Funding LLCs, after the indebtedness is paid in full, any remaining collections will ultimately be available to be distributed to us as the sole member of the respective Funding LLC. The table below sets forth certain additional details regarding the outstanding Term ABS financings: (Dollars in millions) Term ABS Financings Close Date Net Book Value of Loans Contributed at Closing 24 month Revolving Period Term ABS 2014-2 September 25, 2014 $ 437.6 Through September 15, 2016 Term ABS 2015-1 January 29, 2015 $ 375.9 Through January 16, 2017 Term ABS 2015-2 August 20, 2015 $ 375.5 Through August 15, 2017 Term ABS 2016-1 February 26, 2016 $ 481.4 Through February 15, 2018 Term ABS 2016-2 May 12, 2016 $ 437.8 Through May 15, 2018 Term ABS 2016-3 October 27, 2016 $ 437.8 Through October 15, 2018 Term ABS 2017-1 February 23, 2017 $ 437.8 Through February 15, 2019 Term ABS 2017-2 June 29, 2017 $ 563.2 Through June 17, 2019 Senior Notes On March 30, 2015 , we issued $250.0 million aggregate principal amount of 7.375% senior notes due 2023 (the “2023 senior notes”). The 2023 senior notes were issued pursuant to an indenture, dated as of March 30, 2015, among the Company, as issuer, the Company’s subsidiaries Buyers Vehicle Protection Plan, Inc. and Vehicle Remarketing Services, Inc., as guarantors (collectively, the “Guarantors”), and U.S. Bank National Association, as trustee. The 2023 senior notes mature on March 15, 2023 and bear interest at a rate of 7.375% per annum, computed on the basis of a 360-day year composed of twelve 30-day months and payable semi-annually on March 15 and September 15 of each year, beginning on September 15, 2015. The 2023 senior notes were issued at a price of 99.266% of their aggregate principal amount, resulting in gross proceeds of $248.2 million , and a yield to maturity of 7.5% per annum. We used the net proceeds from the offering of the notes for general corporate purposes, including repayment of outstanding borrowings under our revolving secured line of credit facility. On January 22, 2014 , we issued $300.0 million aggregate principal amount of 6.125% senior notes due 2021 (the “2021 senior notes”). The 2021 senior notes were issued pursuant to an indenture, dated as of January 22, 2014, among the Company, the Guarantors, and U.S. Bank National Association, as trustee. The 2021 senior notes mature on February 15, 2021 and bear interest at a rate of 6.125% per annum, computed on the basis of a 360-day year composed of twelve 30-day months and payable semi-annually on February 15 and August 15 of each year, beginning on August 15, 2014. We used the net proceeds from the 2021 senior notes, together with borrowings under our revolving credit facilities, to redeem in full the $350.0 million aggregate principal amount of our 9.125% first priority senior secured notes due 2017 on February 21, 2014. Both the 2021 and the 2023 senior notes (the "senior notes") are guaranteed on a senior basis by the Guarantors, which are also guarantors of obligations under our revolving secured line of credit facility. Other existing and future subsidiaries of ours may become guarantors of the senior notes in the future. The indentures for the senior notes provide for a guarantor of the senior notes to be released from its obligations under its guarantee of the senior notes under specified circumstances. Debt Covenants As of June 30, 2017 , we were in compliance with our covenants under the revolving secured line of credit facility, including those that require the maintenance of certain financial ratios and other financial conditions. These covenants require a minimum ratio of (1) our net earnings, adjusted for specified items, before income taxes, depreciation, amortization and fixed charges to (2) our fixed charges. These covenants also limit the maximum ratio of our funded debt less unrestricted cash and cash equivalents to tangible net worth. Additionally, we must maintain consolidated net income of not less than $1 for the two most recently ended fiscal quarters. Some of these covenants may indirectly limit the repurchase of common stock or payment of dividends on common stock. Our Warehouse facilities and Term ABS financings also contain covenants that measure the performance of the contributed assets. As of June 30, 2017 , we were in compliance with all such covenants. As of the end of the quarter, we were also in compliance with our covenants under the senior notes indentures.

Derivative and Hedging Instrume

Derivative and Hedging Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Instruments	DERIVATIVE AND HEDGING INSTRUMENTS Interest Rate Caps. We utilize interest rate cap agreements to manage the interest rate risk on certain secured financings. The following tables provide the terms of our interest rate cap agreements that were in effect as of June 30, 2017 and December 31, 2016 : (Dollars in millions) As of June 30, 2017 Facility Amount Facility Name Purpose Start End Notional Cap Interest Rate (1) $ 400.0 Warehouse Facility II Cap Floating Rate 06/2016 12/2017 $ 325.0 5.50 % 100.0 Warehouse Facility IV Cap Floating Rate 04/2016 04/2019 75.0 5.50 % Cap Floating Rate 05/2017 04/2021 25.0 6.50 % 100.0 100.0 Warehouse Facility V Cap Floating Rate 06/2015 07/2018 75.0 5.50 % 385.0 Term ABS 2016-1 Cap Floating Rate 04/2016 02/2019 385.0 5.00 % (Dollars in millions) As of December 31, 2016 Facility Amount Facility Name Purpose Start End Notional Cap Interest Rate (1) $ 400.0 Warehouse Facility II Cap Floating Rate 06/2016 12/2017 $ 325.0 5.50 % 75.0 Warehouse Facility IV Cap Floating Rate 03/2014 03/2017 18.8 5.50 % Cap Floating Rate 04/2016 04/2019 56.2 5.50 % 75.0 100.0 Warehouse Facility V Cap Floating Rate 06/2015 07/2018 75.0 5.50 % 385.0 Term ABS 2016-1 Cap Floating Rate 04/2016 02/2019 385.0 5.00 % (1) Rate excludes the spread over the LIBOR rate. The interest rate caps have not been designated as hedging instruments. As of June 30, 2017 and December 31, 2016 , the interest rate caps had a fair value of less than $0.1 million as the capped rates were significantly above market rates.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS In the normal course of our business, affiliated Dealers assigned Consumer Loans to us under the Portfolio and Purchase Programs. Dealer Loans and Purchased Loans with affiliated Dealers were on the same terms as those with non-affiliated Dealers. Affiliated Dealers were comprised of Dealers owned or controlled by: (1) Donald Foss, our founder, significant shareholder and former Chairman of the Board; and (2) a member of Mr. Foss’s immediate family. On January 3, 2017, Mr. Foss retired as officer, director and employee of the Company and entered into a shareholder agreement with the Company. Under the shareholder agreement, Mr. Foss agreed, until the final adjournment of the tenth annual meeting of shareholders held by the Company after the date of the shareholder agreement, to cause all shares of the Company beneficially owned by him or any of his affiliates or associates to be voted in accordance with the recommendation of the Company’s Board of Directors with respect to election and removal of directors, certain routine matters and any other proposal to be submitted to the Company’s shareholders with respect to any extraordinary transaction providing for the acquisition of all of the Company’s outstanding common stock. As a result, effective January 3, 2017, we no longer consider the remaining Dealers owned or controlled by Mr. Foss or a member of Mr. Foss’s immediate family to be affiliated with us while Mr. Foss’s voting interests in the Company are subject to the voting restrictions under the shareholder agreement and accordingly, we have excluded these Dealers from the affiliated amounts reported effective January 3, 2017. On June 7, 2016, Mr. Foss sold certain affiliated Dealers previously owned or controlled by him to a third party. As a result, we no longer consider these Dealers to be affiliated and accordingly, we have excluded these Dealers from the affiliated amounts reported effective June 7, 2016. Affiliated Dealer Loan balances were $0.0 million and $1.4 million as of June 30, 2017 and December 31, 2016 , respectively. As of June 30, 2017 and December 31, 2016 , affiliated Dealer Loan balances were 0.0% of total consolidated Dealer Loan balances. A summary of related party Loan activity is as follows: (Dollars in millions) For the Three Months Ended June 30, 2017 2016 Affiliated Dealer activity % of consolidated Affiliated Dealer activity (2) % of consolidated (2) Dealer Loan revenue $ — — % $ 0.5 0.4 % New Consumer Loan assignments (1) — — % 3.2 0.5 % Accelerated Dealer Holdback payments — — % 0.1 0.7 % Dealer Holdback payments — — % 0.3 0.8 % (Dollars in millions) For the Six Months Ended June 30, 2017 2016 Affiliated Dealer activity % of consolidated Affiliated Dealer activity (2) % of consolidated (2) Dealer Loan revenue $ — — % $ 1.2 0.3 % New Consumer Loan assignments (1) — — % 7.5 0.5 % Accelerated Dealer Holdback payments — — % 0.2 0.7 % Dealer Holdback payments — — % 0.6 0.8 % (1) Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. (2) We have reclassified related party transactions to reflect the June 2016 sale of certain affiliated Dealers by our founder, significant shareholder and former Chairman of the Board.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES A reconciliation of the U.S. federal statutory rate to our effective tax rate is as follows: For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 U.S. federal statutory rate 35.0 % 35.0 % 35.0 % 35.0 % State income taxes 1.8 % 1.8 % 1.8 % 1.8 % Excess tax benefits from stock-based compensation plans — % — % -0.8 % — % Other 0.1 % 0.2 % 0.1 % 0.3 % Effective tax rate 36.9 % 37.0 % 36.1 % 37.1 % The differences between the U.S. federal statutory rate and our effective tax rate are primarily due to state income taxes and excess tax benefits from stock-based compensation plans. The decrease in the effective tax rate for the six months ended June 30, 2017 is primarily due to the adoption of ASU 2016-09 on January 1, 2017, which changed where we recognize excess tax benefits and deficiencies from stock-based compensation plans in our consolidated financial statements on a prospective basis. We receive a tax deduction upon the vesting of restricted stock and the conversion of restricted stock units to common stock based on the fair value of the shares. The amount that this tax deduction differs from the grant-date fair value that was recognized as stock-based compensation expense is referred to as an excess tax benefit or deficiency. For the six months ended June 30, 2017, excess tax benefits of $2.5 million were recognized in provision for income taxes, thus reducing our effective tax rate. For the six months ended June 30, 2016, excess tax benefits of $27.2 million were recognized in paid-in capital in our consolidated balance sheets, which had no impact on our effective tax rate.

Net Income Per Share

Net Income Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income Per Share	NET INCOME PER SHARE Basic net income per share has been computed by dividing net income by the basic number of weighted average shares outstanding. Diluted net income per share has been computed by dividing net income by the diluted number of weighted average shares outstanding using the treasury stock method. The share effect is as follows: For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Weighted average shares outstanding: Common shares 19,201,560 20,159,197 19,341,193 20,094,542 Vested restricted stock units 256,595 220,360 248,400 312,837 Basic number of weighted average shares outstanding 19,458,155 20,379,557 19,589,593 20,407,379 Dilutive effect of restricted stock and restricted stock units 5,366 3,247 26,256 26,145 Dilutive number of weighted average shares outstanding 19,463,521 20,382,804 19,615,849 20,433,524 For the three months ended June 30, 2017 and June 30, 2016 , there were no shares of restricted stock or restricted stock units that would have been anti-dilutive. For the six months ended June 30, 2017 and June 30, 2016 , there were 8,439 and 7,426 shares of restricted stock, respectively, that were not included in the computation of diluted net income per share because their inclusion would have been anti-dilutive.

Stock Repurchases

Stock Repurchases	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Stock Repurchases	STOCK REPURCHASES The following table summarizes our stock repurchases for the three and six months ended June 30, 2017 and 2016 : (Dollars in millions) For the Three Months Ended June 30, 2017 2016 Stock Repurchases Number of Shares Repurchased Cost Number of Shares Repurchased Cost Open Market (1) 81,737 $ 17.7 — $ — (Dollars in millions) For the Six Months Ended June 30, 2017 2016 Stock Repurchases Number of Shares Repurchased Cost Number of Shares Repurchased Cost Open Market (1) 588,580 $ 119.1 45,300 $ 7.6 Other (2) 21,680 4.4 170,668 33.2 Total 610,260 $ 123.5 215,968 $ 40.8 (1) Represents repurchases under authorizations by the board of directors for the repurchase of shares by us from time to time in the open market or in privately negotiated transactions. On February 13, 2017, the board of directors authorized the repurchase of up to one million shares of our common stock in addition to the board’s prior authorizations. As of June 30, 2017 , we had authorization to repurchase 776,208 shares of our common stock. (2) Represents shares of common stock released to us by team members as payment of tax withholdings upon the vesting of restricted stock and restricted stock units and the conversion of restricted stock units to common stock.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	6 Months Ended
	Jun. 30, 2017
Share-based Compensation [Abstract]
Stock-Based Compensation Plans	STOCK-BASED COMPENSATION PLANS Stock-based compensation expense consists of the following: (In millions) For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Restricted stock $ 0.7 $ 0.7 $ 1.4 $ 1.4 Restricted stock units 2.2 1.0 4.0 2.4 Total $ 2.9 $ 1.7 $ 5.4 $ 3.8

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Litigation and Contingent Liabilities	In the normal course of business and as a result of the consumer-oriented nature of the industry in which we operate, we and other industry participants are frequently subject to various consumer claims, litigation and regulatory investigations seeking damages, fines and statutory penalties. The claims allege, among other theories of liability, violations of state, federal and foreign truth-in-lending, credit availability, credit reporting, consumer protection, warranty, debt collection, insurance and other consumer-oriented laws and regulations, including claims seeking damages for physical and mental damages relating to the repossession and sale of consumers' vehicles and other debt collection activities. As the assignee of Consumer Loans originated by Dealers, we may also be named as a co-defendant in lawsuits filed by consumers principally against Dealers. We may also have disputes and litigation with Dealers. The claims may allege, among other theories of liability, that we breached our Dealer servicing agreement. The damages, fines and penalties that may be claimed by consumers, regulatory agencies or Dealers in these types of matters can be substantial. The relief requested by plaintiffs varies but may include requests for compensatory, statutory and punitive damages and injunctive relief, and plaintiffs may seek treatment as purported class actions. An adverse ultimate disposition in any action to which we are a party or otherwise subject could have a material adverse impact on our financial position, liquidity and results of operations. The following matters include current actions to which we are a party and updates to matters that were disclosed in our Annual Report on Form 10-K for the year ended December 31, 2016 . As of June 2017, we were informed that the Consumer Financial Protection Bureau’s Office of Fair Lending and Equal Opportunity is investigating whether the Company may have violated the Equal Credit Opportunity Act and Regulation B. We are cooperating with the inquiry and cannot predict the eventual scope, duration or outcome at this time. As a result, we are unable to estimate the reasonably possible loss or range of reasonably possible loss arising from this inquiry. On November 7, 2016, we received a civil investigative demand from the Federal Trade Commission seeking information on the Company’s policies, practices and procedures in allowing car dealers to use GPS Starter Interrupters on consumer vehicles. We are cooperating with the inquiry and cannot predict the eventual scope, duration or outcome at this time. As a result, we are unable to estimate the reasonably possible loss or range of reasonably possible loss arising from this investigation. On March 18, 2016, we received a subpoena from the Attorney General of the State of Maryland, relating to the Company’s repossession and sale policies and procedures in the state of Maryland. We are cooperating with the inquiry and cannot predict the eventual scope, duration or outcome at this time. As a result, we are unable to estimate the reasonably possible loss or range of reasonably possible loss arising from this investigation. On February 19, 2016, we received a First Amended Complaint filed by Westlake Services d/b/a Westlake Financial Service and Nowcom Corporation, alleging that the Company has attempted to monopolize the indirect financing profit sharing program market in violation of Section 2 of the Sherman Act and seeking, among other things, injunctive relief and unspecified money damages, which, if awarded, would likely be trebled pursuant to the Sherman Act. The case was filed in the United States District Court, Central District of California, Western Division. On April 6, 2016, the Court dismissed the claims brought by Nowcom Corporation. We cannot predict the duration or outcome of this lawsuit at this time. As a result, we are unable to estimate the reasonably possible loss or range of reasonably possible loss arising from this lawsuit. The Company intends to vigorously defend itself in this matter. On September 18, 2015, we received a subpoena from the Attorney General of the State of New York, Civil Rights Bureau relating to the Company’s origination and collection of Consumer Loans in the state of New York. We have cooperated with the inquiry, but cannot predict the eventual scope, duration or outcome at this time. As a result, we are unable to estimate the reasonably possible loss or range of reasonably possible loss arising from this investigation. On December 9, 2014, we received a civil investigative subpoena from the U.S. Department of Justice pursuant to the Financial Institutions Reform, Recovery, and Enforcement Act of 1989 directing us to produce certain information relating to subprime automotive finance and related securitization activities. We have cooperated with the inquiry, but cannot predict the eventual scope, duration or outcome at this time. As a result, we are unable to estimate the reasonably possible loss or range of reasonably possible loss arising from this investigation. On December 4, 2014, we received a civil investigative demand from the Office of the Attorney General of the Commonwealth of Massachusetts relating to the origination and collection of non-prime auto loans in Massachusetts. We have cooperated with the inquiry, but cannot predict the eventual scope, duration or outcome at this time. As a result, we are unable to estimate the reasonably possible loss or range of reasonably possible loss arising from this investigation.

Subsequent Events Subsequent Ev

Subsequent Events Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS On July 18, 2017, we extended the date on which Warehouse Facility VI will cease to revolve from September 30, 2018 to September 30, 2020. There were no other material changes to the terms of the facility.

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Business Segment Information	Business Segment Information We currently operate in one reportable segment which represents our core business of offering financing programs that enable Dealers to sell vehicles to consumers, regardless of their credit history. The consolidated financial statements reflect the financial results of our one reportable operating segment.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash equivalents consist of readily marketable securities with original maturities at the date of acquisition of three months or less. As of June 30, 2017 and December 31, 2016 , we had $26.9 million and $14.3 million , respectively, in cash and cash equivalents that were not insured by the Federal Deposit Insurance Corporation (“FDIC”).
Restricted Cash and Cash Equivalents	Restricted Cash and Cash Equivalents Restricted cash and cash equivalents consist of cash pledged as collateral for secured financings and cash held in a trust for future vehicle service contract claims. As of June 30, 2017 and December 31, 2016 , we had $313.3 million and $224.1 million , respectively, in restricted cash and cash equivalents that were not insured by the FDIC.
Loans Receivable and Allowance for Credit Losses	Loans Receivable and Allowance for Credit Losses Consumer Loan Assignment. For legal purposes, a Consumer Loan is considered to have been assigned to us after the following has occurred: • the consumer and Dealer have signed a Consumer Loan contract; and • we have received the executed Consumer Loan contract and supporting documentation in either physical or electronic form. For accounting and financial reporting purposes, a Consumer Loan is considered to have been assigned to us after the following has occurred: • the Consumer Loan has been legally assigned to us; and • we have made a funding decision and generally have provided funding to the Dealer in the form of either an advance under the Portfolio Program or one-time purchase payment under the Purchase Program. Portfolio Segments and Classes. We are considered to be a lender to our Dealers for Consumer Loans assigned under our Portfolio Program and a purchaser of Consumer Loans assigned under our Purchase Program. As a result, our Loan portfolio consists of two portfolio segments: Dealer Loans and Purchased Loans. Each portfolio segment is comprised of one class of Consumer Loan assignments, which is Consumer Loans originated by Dealers to finance purchases of vehicles and related ancillary products by consumers with impaired or limited credit histories. Dealer Loans . Amounts advanced to Dealers for Consumer Loans assigned under the Portfolio Program are recorded as Dealer Loans and are aggregated by Dealer for purposes of recognizing revenue and evaluating impairment. We account for Dealer Loans based on forecasted cash flows instead of contractual cash flows as we do not expect to collect all of the contractually specified amounts due to the credit quality of the underlying Consumer Loans. The outstanding balance of each Dealer Loan included in Loans receivable is comprised of the following: • the aggregate amount of all cash advances paid; • finance charges; • Dealer Holdback payments; • accelerated Dealer Holdback payments; and • recoveries. Less: • collections (net of certain collection costs); and • write-offs. An allowance for credit losses is maintained at an amount that reduces the net asset value (Dealer Loan balance less the allowance) to the value of forecasted future cash flows discounted at the yield established at the time of assignment. This allowance calculation is completed for each individual Dealer. Future cash flows are comprised of estimated future collections on the Consumer Loans, less any estimated Dealer Holdback payments. We write off Dealer Loans once there are no forecasted future cash flows on any of the associated Consumer Loans, which generally occurs 120 months after the last Consumer Loan assignment. Future collections on Dealer Loans are forecasted for each individual Dealer based on the historical performance of Consumer Loans with similar characteristics, adjusted for recent trends in payment patterns. Dealer Holdback is forecasted for each individual Dealer based on the expected future collections and current advance balance of each Dealer Loan. Cash flows from any individual Dealer Loan are often different than estimated cash flows at the time of assignment. If such difference is favorable, the difference is recognized prospectively into income over the remaining life of the Dealer Loan through a yield adjustment. If such difference is unfavorable, a provision for credit losses is recorded immediately as a current period expense and a corresponding allowance for credit losses is established. Because differences between estimated cash flows at the time of assignment and actual cash flows occur often, an allowance is required for a significant portion of our Dealer Loan portfolio. An allowance for credit losses does not necessarily indicate that a Dealer Loan is unprofitable, and seldom are cash flows from a Dealer Loan insufficient to repay the initial amounts advanced to the Dealer. Purchased Loans . Amounts paid to Dealers for Consumer Loans assigned under the Purchase Program are recorded as Purchased Loans and are aggregated into pools based on the month of purchase for purposes of recognizing revenue and evaluating impairment. We account for Purchased Loans based on forecasted cash flows instead of contractual cash flows as we do not expect to collect all of the contractually specified amounts due to the credit quality of the assigned Consumer Loans. The outstanding balance of each Purchased Loan pool included in Loans receivable is comprised of the following: • the aggregate amount of all amounts paid during the month of purchase to purchase Consumer Loans from Dealers; • finance charges; and • recoveries. Less: • collections (net of certain collection costs); and • write-offs. An allowance for credit losses is maintained at an amount that reduces the net asset value (Purchased Loan pool balance less the allowance) to the value of forecasted future cash flows discounted at the yield established at the time of assignment. This allowance calculation is completed for each individual monthly pool of Purchased Loans. Future cash flows are comprised of estimated future collections on the pool of Purchased Loans. We write off pools of Purchased Loans once there are no forecasted future cash flows on any of the Purchased Loans included in the pool, which generally occurs 120 months after the month of purchase. Future collections on Purchased Loans are forecasted for each individual pool based on the historical performance of Consumer Loans with similar characteristics, adjusted for recent trends in payment patterns. Cash flows from any individual pool of Purchased Loans are often different than estimated cash flows at the time of assignment. If such difference is favorable, the difference is recognized prospectively into income over the remaining life of the pool of Purchased Loans through a yield adjustment. If such difference is unfavorable, a provision for credit losses is recorded immediately as a current period expense and a corresponding allowance for credit losses is established. Credit Quality. Substantially all of the Consumer Loans assigned to us are made to individuals with impaired or limited credit histories or higher debt-to-income ratios than are permitted by traditional lenders. Consumer Loans made to these individuals generally entail a higher risk of delinquency, default and repossession and higher losses than loans made to consumers with better credit. Since most of our revenue and cash flows are generated from these Consumer Loans, our ability to accurately forecast Consumer Loan performance is critical to our business and financial results. At the time the Consumer Loan is submitted to us for assignment, we forecast future expected cash flows from the Consumer Loan. Based on these forecasts, an advance or one-time purchase payment is made to the related Dealer at a price designed to maximize economic profit, a non-GAAP financial measure that considers our return on capital, our cost of capital and the amount of capital invested. We monitor and evaluate the credit quality of Consumer Loans on a monthly basis by comparing our current forecasted collection rates to our initial expectations. We use a statistical model that considers a number of credit quality indicators to estimate the expected collection rate for each Consumer Loan at the time of assignment. The credit quality indicators considered in our model include attributes contained in the consumer’s credit bureau report, data contained in the consumer’s credit application, the structure of the proposed transaction, vehicle information and other factors. We continue to evaluate the expected collection rate of each Consumer Loan subsequent to assignment primarily through the monitoring of consumer payment behavior. Our evaluation becomes more accurate as the Consumer Loans age, as we use actual performance data in our forecast. Since all known, significant credit quality indicators have already been factored into our forecasts and pricing, we are not able to use any specific credit quality indicators to predict or explain variances in actual performance from our initial expectations. Any variances in performance from our initial expectations are the result of Consumer Loans performing differently than historical Consumer Loans with similar characteristics. We periodically adjust our statistical pricing model for new trends that we identify through our evaluation of these forecasted collection rate variances. When overall forecasted collection rates underperform our initial expectations, the decline in forecasted collections has a more adverse impact on the profitability of the Purchased Loans than on the profitability of the Dealer Loans. For Purchased Loans, the decline in forecasted collections is absorbed entirely by us. For Dealer Loans, the decline in the forecasted collections is substantially offset by a decline in forecasted payments of Dealer Holdback. Methodology Changes . For the three and six months ended June 30, 2017 and 2016 , we did not make any methodology changes for Loans that had a material impact on our financial statements.
Reinsurance	Reinsurance VSC Re Company (“VSC Re”), our wholly-owned subsidiary, is engaged in the business of reinsuring coverage under vehicle service contracts sold to consumers by Dealers on vehicles financed by us. VSC Re currently reinsures vehicle service contracts that are offered through one of our third party providers. Vehicle service contract premiums, which represent the selling price of the vehicle service contract to the consumer, less fees and certain administrative costs, are contributed to a trust account controlled by VSC Re. These premiums are used to fund claims covered under the vehicle service contracts. VSC Re is a bankruptcy remote entity. As such, our exposure to fund claims is limited to the trust assets controlled by VSC Re and our net investment in VSC Re. Premiums from the reinsurance of vehicle service contracts are recognized over the life of the policy in proportion to expected costs of servicing those contracts. Expected costs are determined based on our historical claims experience. Claims are expensed through a provision for claims in the period the claim was incurred. Capitalized acquisition costs are comprised of premium taxes and are amortized as general and administrative expense over the life of the contracts in proportion to premiums earned. We have consolidated the trust within our financial statements based on our determination of the following: • We have a variable interest in the trust. We have a residual interest in the assets of the trust, which is variable in nature, given that it increases or decreases based upon the actual loss experience of the related service contracts. In addition, VSC Re is required to absorb any losses in excess of the trust's assets. • The trust is a variable interest entity. The trust has insufficient equity at risk as no parties to the trust were required to contribute assets that provide them with any ownership interest. • We are the primary beneficiary of the trust. We control the amount of premium written and placed in the trust through Consumer Loan assignments under our Programs, which is the activity that most significantly impacts the economic performance of the trust. We have the right to receive benefits from the trust that could potentially be significant. In addition, VSC Re has the obligation to absorb losses of the trust that could potentially be significant.
New Accounting Updates	New Accounting Updates Adopted During the Current Year Improvements to Employee Share-Based Payment Accounting. In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, which simplifies the accounting for share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and the classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years, and interim periods, beginning after December 15, 2016, with early adoption permitted. The adoption of ASU 2016-09 on January 1, 2017 changed where we recognize excess tax benefits and deficiencies from stock-based compensation plans in our consolidated financial statements on a prospective basis. We receive a tax deduction upon the vesting of restricted stock and the conversion of restricted stock units to common stock based on the fair value of the shares. The amount that this tax deduction differs from the grant-date fair value that was recognized as stock-based compensation expense is referred to as an excess tax benefit or deficiency. For periods prior to adoption, these excess tax benefits or deficiencies were recognized in paid-in capital in our consolidated balance sheets and reported as a financing activity in our consolidated statements of cash flows. Upon adoption, these excess tax benefits or deficiencies are recognized in provision for income taxes in our consolidated statements of income and reported as an operating activity in our consolidated statements of cash flows. As a result of the adoption, excess tax benefits of $2.5 million decreased our provision for income taxes, increased our net cash provided by operating activities and decreased our net cash provided by financing activities for the six months ended June 30, 2017. New Accounting Updates Not Yet Adopted Restricted Cash. In November 2016, the FASB issued ASU 2016-18, which amends Topic 230 (Statement of Cash Flows) and requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is intended to reduce diversity in practice in how restricted cash or restricted cash equivalents are presented and classified in the statement of cash flows. ASU 2016-18 is effective for fiscal years, and interim periods, beginning after December 15, 2017, with early adoption permitted. The standard requires application using a retrospective transition method. The adoption of ASU 2016-18 on January 1, 2018 will change the presentation and classification of restricted cash and restricted cash equivalents in our consolidated statements of cash flows. Measurement of Credit Losses on Financial Instruments. In June 2016, the FASB issued ASU 2016-13, which includes an impairment model (known as the current expected credit loss (CECL) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses. ASU 2016-13 is effective for fiscal years, and interim periods, beginning after December 15, 2019. Early application is permitted for fiscal years, and interim periods, beginning after December 15, 2018. While we continue to assess the impact of ASU 2016-13, based on our preliminary assessment, we believe the adoption will have a material impact on our consolidated financial statements and related disclosures. Revenue from Contracts with Customers. In May 2014, the FASB issued ASU 2014-09, which supersedes the revenue recognition requirements Topic 605 (Revenue Recognition), and most industry-specific guidance. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). In August 2015, the FASB issued ASU 2015-14 to defer the effective date of ASU 2014-09 by one year to fiscal years beginning after December 15, 2017. ASU 2015-14 also permits early adoption of ASU 2014-09, but not before the original effective date, which was for fiscal years beginning after December 15, 2016. We plan on adopting ASU 2014-09, as amended by ASU 2015-14, on January 1, 2018 using the modified retrospective method and do not believe the adoption will have a material impact on our consolidated financial statements and related disclosures. Given that the guidance is not applicable to our finance charges and premiums earned sources of revenue, our assessment has focused on our other income source of revenue. Based on our assessment completed to date, we do not expect the adoption of ASU 2014-09, as amended by ASU 2015-14, to have a material impact on the timing of revenue recognition and financial statement presentation of our other income source of revenue. Leases. In February 2016, the FASB issued ASU 2016-02, which requires lessees to recognize a right-of-use asset and related lease liability for leases classified as operating leases at the commencement date that have lease terms of more than 12 months. This ASU retains the classification distinction between finance leases and operating leases. ASU 2016-02 is effective for fiscal years, and interim periods, beginning after December 15, 2018. Early application is permitted, but we have not yet adopted ASU 2016-02. We are currently assessing the impact the adoption of ASU 2016-02 will have on our consolidated financial statements and related disclosures.

Description of Business (Tables

Description of Business (Tables)	6 Months Ended
	Jun. 30, 2017
Description Of Business [Abstract]
Percentage of Consumer Loans Assigned with FICO Score of Less Than 650 or No FICO Score	The following table shows the percentage of Consumer Loans assigned to us with either FICO ® scores below 650 or no FICO ® scores: For the Three Months Ended June 30, For the Six Months Ended June 30, Consumer Loan Assignment Volume 2017 2016 2017 2016 Percentage of total unit volume with either FICO ® scores below 650 or no FICO ® scores 95.3 % 95.4 % 95.9 % 96.1 %
Schedule of Percentage of Consumer Loans Assigned Based on Unit Volumes	Unit Volume Dollar Volume (1) Three Months Ended Dealer Loans Purchased Loans Dealer Loans Purchased Loans March 31, 2016 82.4 % 17.6 % 75.6 % 24.4 % June 30, 2016 77.8 % 22.2 % 69.8 % 30.2 % September 30, 2016 76.2 % 23.8 % 68.5 % 31.5 % December 31, 2016 76.9 % 23.1 % 71.1 % 28.9 % March 31, 2017 73.3 % 26.7 % 67.8 % 32.2 % June 30, 2017 72.3 % 27.7 % 67.9 % 32.1 % (1) Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. Payments of Dealer Holdback and accelerated Dealer Holdback are not included.

Fair Value of Financial Instr25

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Comparison of the Carrying Value and Estimated Fair Value of Financial Instruments	A comparison of the carrying value and estimated fair value of these financial instruments is as follows: (In millions) As of June 30, 2017 As of December 31, 2016 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets Cash and cash equivalents $ 27.2 $ 27.2 $ 14.6 $ 14.6 Restricted cash and cash equivalents 313.9 313.9 224.7 224.7 Restricted securities available for sale 46.5 46.5 45.3 45.3 Loans receivable, net 4,283.6 4,361.0 3,886.6 3,955.9 Liabilities Secured financing $ 2,472.3 $ 2,489.3 $ 2,062.4 $ 2,072.0 Senior notes 542.1 567.1 541.3 560.5
Schedule of Assets and Liabilities, Measured at Fair Value on a Recurring Basis	: (In millions) As of June 30, 2017 Level 1 Level 2 Level 3 Total Fair Value Assets Cash and cash equivalents $ 27.2 $ — $ — $ 27.2 Restricted cash and cash equivalents 313.9 — — 313.9 Restricted securities available for sale (1) 37.5 9.0 — 46.5 Loans receivable, net — — 4,361.0 4,361.0 Liabilities Secured financing $ — $ 2,489.3 $ — $ 2,489.3 Senior notes 567.1 — — 567.1 (In millions) As of December 31, 2016 Level 1 Level 2 Level 3 Total Fair Value Assets Cash and cash equivalents $ 14.6 $ — $ — $ 14.6 Restricted cash and cash equivalents 224.7 — — 224.7 Restricted securities available for sale (1) 37.1 8.2 — 45.3 Loans receivable, net — — 3,955.9 3,955.9 Liabilities Secured financing $ — $ 2,072.0 $ — $ 2,072.0 Senior notes 560.5 — — 560.5 (1) Measured and recorded at fair value on a recurring basis.

Restricted Securities Availab26

Restricted Securities Available For Sale (Tables)	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Schedule of Restricted Securities Available for Sale	Restricted securities available for sale consist of the following: (In millions) As of June 30, 2017 Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government and agency securities $ 18.8 $ — $ (0.1 ) $ 18.7 Corporate bonds 18.7 0.1 — 18.8 Asset-backed securities 6.4 — — 6.4 Mortgage-backed securities 2.6 — — 2.6 Total restricted securities available for sale $ 46.5 $ 0.1 $ (0.1 ) $ 46.5 (In millions) As of December 31, 2016 Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Government and agency securities $ 20.4 $ — $ (0.1 ) $ 20.3 Corporate bonds 16.9 0.1 (0.2 ) 16.8 Asset-backed securities 5.0 — — 5.0 Mortgage-backed securities 3.2 — — 3.2 Total restricted securities available for sale $ 45.5 $ 0.1 $ (0.3 ) $ 45.3
Schedule of Restricted Securities Available for Sale by Aging Category	The fair value and gross unrealized losses for restricted securities available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are as follows: (In millions) Securities Available for Sale with Gross Unrealized Losses as of June 30, 2017 Less than 12 Months 12 Months or More Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Total Estimated Fair Value Total Gross Unrealized Losses U.S. Government and agency securities $ 13.4 $ (0.1 ) $ — $ — $ 13.4 $ (0.1 ) Corporate bonds 7.3 — — — 7.3 — Asset-backed securities 3.0 — — — 3.0 — Mortgage-backed securities 1.7 — — — 1.7 — Total restricted securities available for sale $ 25.4 $ (0.1 ) $ — $ — $ 25.4 $ (0.1 ) (In millions) Securities Available for Sale with Gross Unrealized Losses as of December 31, 2016 Less than 12 Months 12 Months or More Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Total Estimated Fair Value Total Gross Unrealized Losses U.S. Government and agency securities $ 16.4 $ (0.1 ) $ — $ — $ 16.4 $ (0.1 ) Corporate bonds 11.8 (0.2 ) — — 11.8 (0.2 ) Asset-backed securities 2.8 — — — 2.8 — Mortgage-backed securities 2.4 — — — 2.4 — Total restricted securities available for sale $ 33.4 $ (0.3 ) $ — $ — $ 33.4 $ (0.3 )
Schedule of Cost and Estimated Fair Values of Debt Securities by Contractual Maturity	The cost and estimated fair values of debt securities by contractual maturity were as follows (securities with multiple maturity dates are classified in the period of final maturity). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. (In millions) As of June 30, 2017 December 31, 2016 Contractual Maturity Cost Estimated Fair Value Cost Estimated Fair Value Within one year $ 0.8 $ 0.8 $ 1.6 $ 1.6 Over one year to five years 39.7 39.7 39.3 39.1 Over five years to ten years 3.5 3.5 2.2 2.2 Over ten years 2.5 2.5 2.4 2.4 Total restricted securities available for sale $ 46.5 $ 46.5 $ 45.5 $ 45.3

Loans Receivable (Tables)

Loans Receivable (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Schedule of Loans Receivable	Loans receivable consists of the following: (In millions) As of June 30, 2017 Dealer Loans Purchased Loans Total Loans receivable $ 3,385.3 $ 1,252.4 $ 4,637.7 Allowance for credit losses (336.9 ) (17.2 ) (354.1 ) Loans receivable, net $ 3,048.4 $ 1,235.2 $ 4,283.6 (In millions) As of December 31, 2016 Dealer Loans Purchased Loans Total Loans receivable $ 3,209.0 $ 998.0 $ 4,207.0 Allowance for credit losses (309.3 ) (11.1 ) (320.4 ) Loans receivable, net $ 2,899.7 $ 986.9 $ 3,886.6
Summary of Changes in Loans Receivable	A summary of changes in Loans receivable is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 3,326.5 $ 1,147.5 $ 4,474.0 New Consumer Loan assignments (1) 456.3 215.5 671.8 Principal collected on Loans receivable (438.2 ) (111.1 ) (549.3 ) Accelerated Dealer Holdback payments 13.4 — 13.4 Dealer Holdback payments 33.5 — 33.5 Transfers (2) (1.1 ) 1.1 — Write-offs (5.5 ) (0.7 ) (6.2 ) Recoveries (3) 0.4 0.1 0.5 Balance, end of period $ 3,385.3 $ 1,252.4 $ 4,637.7 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 2,985.7 $ 640.5 $ 3,626.2 New Consumer Loan assignments (1) 438.0 189.4 627.4 Principal collected on Loans receivable (420.5 ) (68.1 ) (488.6 ) Accelerated Dealer Holdback payments 14.9 — 14.9 Dealer Holdback payments 35.9 — 35.9 Transfers (2) (1.1 ) 1.1 — Write-offs (4.1 ) (0.1 ) (4.2 ) Recoveries (3) 0.4 — 0.4 Balance, end of period $ 3,049.2 $ 762.8 $ 3,812.0 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 3,209.0 $ 998.0 $ 4,207.0 New Consumer Loan assignments (1) 993.2 470.1 1,463.3 Principal collected on Loans receivable (899.2 ) (217.1 ) (1,116.3 ) Accelerated Dealer Holdback payments 23.6 — 23.6 Dealer Holdback payments 68.7 — 68.7 Transfers (2) (2.2 ) 2.2 — Write-offs (8.5 ) (0.9 ) (9.4 ) Recoveries (3) 0.7 0.1 0.8 Balance, end of period $ 3,385.3 $ 1,252.4 $ 4,637.7 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 2,823.4 $ 521.7 $ 3,345.1 New Consumer Loan assignments (1) 1,000.7 370.8 1,371.5 Principal collected on Loans receivable (871.3 ) (132.1 ) (1,003.4 ) Accelerated Dealer Holdback payments 29.7 — 29.7 Dealer Holdback payments 75.8 — 75.8 Transfers (2) (2.5 ) 2.5 — Write-offs (7.3 ) (0.1 ) (7.4 ) Recoveries (3) 0.7 — 0.7 Balance, end of period $ 3,049.2 $ 762.8 $ 3,812.0 (1) The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. (2) Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance to Purchased Loans in the period this forfeiture occurs. (3) Represents collections received on previously written off Loans.
Summary of Changes in Accretable Yield	A summary of changes in the accretable yield is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 1,028.1 $ 414.6 $ 1,442.7 New Consumer Loan assignments (1) 186.8 88.5 275.3 Accretion (2) (193.0 ) (60.9 ) (253.9 ) Provision for credit losses 18.2 3.6 21.8 Forecast changes (1.5 ) 10.3 8.8 Transfers (3) (0.2 ) 0.3 0.1 Balance, end of period $ 1,038.4 $ 456.4 $ 1,494.8 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 946.6 $ 238.6 $ 1,185.2 New Consumer Loan assignments (1) 183.6 70.3 253.9 Accretion (2) (180.4 ) (37.0 ) (217.4 ) Provision for credit losses 17.9 — 17.9 Forecast changes (3.9 ) 10.4 6.5 Transfers (3) (0.6 ) 1.0 0.4 Balance, end of period $ 963.2 $ 283.3 $ 1,246.5 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 982.6 $ 348.1 $ 1,330.7 New Consumer Loan assignments (1) 406.5 191.9 598.4 Accretion (2) (380.8 ) (113.3 ) (494.1 ) Provision for credit losses 35.4 6.9 42.3 Forecast changes (4.9 ) 21.8 16.9 Transfers (3) (0.4 ) 1.0 0.6 Balance, end of period $ 1,038.4 $ 456.4 $ 1,494.8 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 874.2 $ 198.6 $ 1,072.8 New Consumer Loan assignments (1) 417.7 137.6 555.3 Accretion (2) (354.1 ) (68.4 ) (422.5 ) Provision for credit losses 39.7 0.3 40.0 Forecast changes (13.5 ) 13.3 (0.2 ) Transfers (3) (0.8 ) 1.9 1.1 Balance, end of period $ 963.2 $ 283.3 $ 1,246.5 (1) The Dealer Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related advances paid to Dealers. The Purchased Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Purchase Program, less the related one-time payments made to Dealers. (2) Represents finance charges excluding the amortization of deferred direct origination costs for Dealer Loans. (3) Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance and related expected future net cash flows to Purchased Loans in the period this forfeiture occurs.
Summary of Information Related to New Consumer Loan Assignments	Additional information related to new Consumer Loan assignments is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 726.0 $ 464.9 $ 1,190.9 Expected net cash flows at the time of assignment (2) 643.1 304.0 947.1 Fair value at the time of assignment (3) 456.3 215.5 671.8 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 698.6 $ 382.9 $ 1,081.5 Expected net cash flows at the time of assignment (2) 621.6 259.7 881.3 Fair value at the time of assignment (3) 438.0 189.4 627.4 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 1,580.5 $ 1,016.0 $ 2,596.5 Expected net cash flows at the time of assignment (2) 1,399.7 662.0 2,061.7 Fair value at the time of assignment (3) 993.2 470.1 1,463.3 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Contractual net cash flows at the time of assignment (1) $ 1,588.7 $ 749.5 $ 2,338.2 Expected net cash flows at the time of assignment (2) 1,418.4 508.4 1,926.8 Fair value at the time of assignment (3) 1,000.7 370.8 1,371.5 (1) The Dealer Loans amount represents the repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related Dealer Holdback payments that we would be required to make if we collected all of the contractual repayments. The Purchased Loans amount represents the repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under our Purchase Program. (2) The Dealer Loans amount represents the repayments that we expected to collect at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related Dealer Holdback payments that we expected to make. The Purchased Loans amount represents the repayments that we expected to collect at the time of assignment on Consumer Loans assigned under our Purchase Program. (3) The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program.
Schedule of Consumer Loans Forecasted Collection Percentage	The following table compares our forecast of Consumer Loan collection rates as of June 30, 2017 , with the forecasts as of March 31, 2017, December 31, 2016 and at the time of assignment, segmented by year of assignment: Forecasted Collection Percentage as of (1) Current Forecast Variance from Consumer Loan Assignment Year June 30, 2017 March 31, 2017 December 31, 2016 Initial Forecast March 31, 2017 December 31, 2016 Initial Forecast 2008 70.5 % 70.4 % 70.4 % 69.7 % 0.1 % 0.1 % 0.8 % 2009 79.5 % 79.4 % 79.4 % 71.9 % 0.1 % 0.1 % 7.6 % 2010 77.6 % 77.6 % 77.6 % 73.6 % 0.0 % 0.0 % 4.0 % 2011 74.8 % 74.7 % 74.7 % 72.5 % 0.1 % 0.1 % 2.3 % 2012 73.8 % 73.8 % 73.7 % 71.4 % 0.0 % 0.1 % 2.4 % 2013 73.5 % 73.4 % 73.4 % 72.0 % 0.1 % 0.1 % 1.5 % 2014 71.7 % 71.7 % 71.8 % 71.8 % 0.0 % -0.1 % -0.1 % 2015 65.7 % 65.8 % 66.1 % 67.7 % -0.1 % -0.4 % -2.0 % 2016 65.1 % 65.3 % 65.1 % 65.4 % -0.2 % 0.0 % -0.3 % 2017 (2) 65.5 % 64.9 % — 64.2 % 0.6 % — 1.3 % (1) Represents the total forecasted collections we expect to collect on the Consumer Loans as a percentage of the repayments that we were contractually owed on the Consumer Loans at the time of assignment. Contractual repayments include both principal and interest. Forecasted collection rates are negatively impacted by canceled Consumer Loans as the contractual amount owed is not removed from the denominator for purposes of computing forecasted collection rates in the table. (2) The forecasted collection rate for 2017 Consumer Loans as of June 30, 2017 includes both Consumer Loans that were in our portfolio as of March 31, 2017 and Consumer Loans assigned during the most recent quarter. The following table provides forecasted collection rates for each of these segments: Forecasted Collection Percentage as of Current Forecast Variance from 2017 Consumer Loan Assignment Period June 30, 2017 March 31, 2017 Initial Forecast March 31, 2017 Initial Forecast January 1, 2017 through March 31, 2017 65.5 % 64.9 % 64.0 % 0.6 % 1.5 % April 1, 2017 through June 30, 2017 65.4 % — 64.4 % — 1.0 %
Schedule of Consumer Loans Performance	The following table segments our Loan portfolio by the performance of the Loan pools: (In millions) As of June 30, 2017 Loan Pool Performance Meets or Exceeds Initial Estimates Loan Pool Performance Less than Initial Estimates Dealer Loans Purchased Loans Total Dealer Loans Purchased Loans Total Loans receivable $ 1,104.6 $ 685.0 $ 1,789.6 $ 2,280.7 $ 567.4 $ 2,848.1 Allowance for credit losses — — — (336.9 ) (17.2 ) (354.1 ) Loans receivable, net $ 1,104.6 $ 685.0 $ 1,789.6 $ 1,943.8 $ 550.2 $ 2,494.0 (In millions) As of December 31, 2016 Loan Pool Performance Meets or Exceeds Initial Estimates Loan Pool Performance Less than Initial Estimates Dealer Loans Purchased Loans Total Dealer Loans Purchased Loans Total Loans receivable $ 1,002.2 $ 705.8 $ 1,708.0 $ 2,206.8 $ 292.2 $ 2,499.0 Allowance for credit losses — — — (309.3 ) (11.1 ) (320.4 ) Loans receivable, net $ 1,002.2 $ 705.8 $ 1,708.0 $ 1,897.5 $ 281.1 $ 2,178.6
Summary of Changes in Allowance for Credit Losses	A summary of changes in the allowance for credit losses is as follows: (In millions) For the Three Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 323.8 $ 14.2 $ 338.0 Provision for credit losses 18.2 3.6 21.8 Write-offs (5.5 ) (0.7 ) (6.2 ) Recoveries (1) 0.4 0.1 0.5 Balance, end of period $ 336.9 $ 17.2 $ 354.1 (In millions) For the Three Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 254.0 $ 8.8 $ 262.8 Provision for credit losses 17.9 — 17.9 Write-offs (4.1 ) (0.1 ) (4.2 ) Recoveries (1) 0.4 — 0.4 Balance, end of period $ 268.2 $ 8.7 $ 276.9 (In millions) For the Six Months Ended June 30, 2017 Dealer Loans Purchased Loans Total Balance, beginning of period $ 309.3 $ 11.1 $ 320.4 Provision for credit losses 35.4 6.9 42.3 Write-offs (8.5 ) (0.9 ) (9.4 ) Recoveries (1) 0.7 0.1 0.8 Balance, end of period $ 336.9 $ 17.2 $ 354.1 (In millions) For the Six Months Ended June 30, 2016 Dealer Loans Purchased Loans Total Balance, beginning of period $ 235.1 $ 8.5 $ 243.6 Provision for credit losses 39.7 0.3 40.0 Write-offs (7.3 ) (0.1 ) (7.4 ) Recoveries (1) 0.7 — 0.7 Balance, end of period $ 268.2 $ 8.7 $ 276.9 (1) Represents collections received on previously written off Loans.

Reinsurance Reinsurance (Tables

Reinsurance Reinsurance (Tables)	6 Months Ended
	Jun. 30, 2017
Insurance [Abstract]
Summary of Reinsurance Activity	A summary of reinsurance activity is as follows: (In millions) For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Net assumed written premiums $ 9.6 $ 9.0 $ 21.9 $ 20.9 Net premiums earned 10.5 10.9 20.6 21.7 Provision for claims 6.1 7.0 12.1 13.8 Amortization of capitalized acquisition costs 0.2 0.3 0.5 0.5
Schedule of Trust Assets and Reinsurance Liabilities	The trust assets and related reinsurance liabilities are as follows: (In millions) As of Balance Sheet location June 30, 2017 December 31, 2016 Trust assets Restricted cash and cash equivalents $ 0.6 $ 0.5 Trust assets Restricted securities available for sale 46.5 45.3 Unearned premium Accounts payable and accrued liabilities 34.1 32.8 Claims reserve (1) Accounts payable and accrued liabilities 1.2 1.0 (1) The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of Principal Debt Outstanding	Debt consists of the following: (In millions) As of June 30, 2017 Principal Outstanding Unamortized Debt Issuance Costs Unamortized Discount Carrying Amount Secured financing (1) $ 2,485.2 $ (12.9 ) $ — $ 2,472.3 Senior notes 550.0 (6.5 ) (1.4 ) 542.1 Total debt $ 3,035.2 $ (19.4 ) $ (1.4 ) $ 3,014.4 (In millions) As of December 31, 2016 Principal Outstanding Unamortized Debt Issuance Costs Unamortized Discount Carrying Amount Secured financing (1) $ 2,072.1 $ (9.7 ) $ — $ 2,062.4 Senior notes 550.0 (7.1 ) (1.6 ) 541.3 Total debt $ 2,622.1 $ (16.8 ) $ (1.6 ) $ 2,603.7 (1) Warehouse facilities and Term ABS.
Schedule of General Information of Financing Transaction	(Dollars in millions) Financings Wholly-owned Subsidiary Maturity Date Financing Amount Interest Rate as of Revolving Secured Line of Credit n/a 06/22/2020 $ 345.0 (1) At our option, either LIBOR plus 187.5 basis points or the prime rate plus 87.5 basis points Warehouse Facility II (2) CAC Warehouse Funding Corp. II 06/23/2019 (4) $ 400.0 LIBOR plus 225 basis points (3) Warehouse Facility IV (2) CAC Warehouse Funding LLC IV 04/30/2020 (4) $ 100.0 LIBOR plus 225 basis points (3) Warehouse Facility V (2) CAC Warehouse Funding LLC V 08/18/2019 (5) $ 100.0 LIBOR plus 225 basis points (3) Warehouse Facility VI (2) CAC Warehouse Funding LLC VI 09/30/2018 (4) $ 75.0 LIBOR plus 200 basis points Term ABS 2014-2 (2) Credit Acceptance Funding LLC 2014-2 09/15/2016 (4) $ 349.0 Fixed rate Term ABS 2015-1 (2) Credit Acceptance Funding LLC 2015-1 01/16/2017 (4) $ 300.6 Fixed rate Term ABS 2015-2 (2) Credit Acceptance Funding LLC 2015-2 08/15/2017 (4) $ 300.2 Fixed rate Term ABS 2016-1 (2) Credit Acceptance Funding LLC 2016-1 02/15/2018 (4) $ 385.0 LIBOR plus 195 basis points (3) Term ABS 2016-2 (2) Credit Acceptance Funding LLC 2016-2 05/15/2018 (4) $ 350.2 Fixed rate Term ABS 2016-3 (2) Credit Acceptance Funding LLC 2016-3 10/15/2018 (4) $ 350.0 Fixed rate Term ABS 2017-1 (2) Credit Acceptance Funding LLC 2017-1 02/15/2019 (4) $ 350.0 Fixed rate Term ABS 2017-2 (2) Credit Acceptance Funding LLC 2017-2 06/17/2019 (4) $ 450.0 Fixed rate 2021 Senior Notes n/a 02/15/2021 $ 300.0 Fixed rate 2023 Senior Notes n/a 03/15/2023 $ 250.0 Fixed rate (1) The amount of the facility will decrease to $300.0 million on June 22, 2019. (2) Financing made available only to a specified subsidiary of the Company. (3) Interest rate cap agreements are in place to limit the exposure to increasing interest rates. (4) Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets. (5) Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on August 18, 2021 will be due on that date.
Schedule of Additional Information Related to Debt Instruments	Additional information related to the amounts outstanding on each facility is as follows: (In millions) For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Revolving Secured Line of Credit Maximum outstanding principal balance $ 276.7 $ 123.7 $ 276.7 $ 186.4 Average outstanding principal balance 178.8 22.2 120.9 39.4 Warehouse Facility II Maximum outstanding principal balance $ 263.4 $ 200.1 $ 263.4 $ 200.1 Average outstanding principal balance 5.8 6.6 5.1 5.5 Warehouse Facility IV Maximum outstanding principal balance $ 12.0 $ 12.0 $ 12.0 $ 12.0 Average outstanding principal balance 11.6 12.0 11.8 12.0 Warehouse Facility V Maximum outstanding principal balance $ 100.0 $ 100.0 $ 100.0 $ 100.0 Average outstanding principal balance 28.9 3.3 15.6 2.1 Warehouse Facility VI Maximum outstanding principal balance $ 75.0 $ 49.9 $ 75.0 $ 49.9 Average outstanding principal balance 28.4 1.6 14.8 6.0
Summary of Debt	(Dollars in millions) As of June 30, 2017 December 31, 2016 Revolving Secured Line of Credit Principal balance outstanding $ — $ — Amount available for borrowing (1) 345.0 310.0 Interest rate — % — % Warehouse Facility II Principal balance outstanding $ — $ — Amount available for borrowing (1) 400.0 400.0 Loans pledged as collateral — — Restricted cash and cash equivalents pledged as collateral 2.7 1.5 Interest rate — % — % Warehouse Facility IV Principal balance outstanding $ — $ 12.0 Amount available for borrowing (1) 100.0 63.0 Loans pledged as collateral — 23.0 Restricted cash and cash equivalents pledged as collateral 0.1 0.9 Interest rate — % 2.77 % Warehouse Facility V Principal balance outstanding $ — $ — Amount available for borrowing (1) 100.0 100.0 Loans pledged as collateral — — Restricted cash and cash equivalents pledged as collateral 1.1 1.0 Interest rate — % — % Warehouse Facility VI Principal balance outstanding $ — $ — Amount available for borrowing (1) 75.0 75.0 Loans pledged as collateral — — Restricted cash and cash equivalents pledged as collateral 0.8 0.1 Interest rate — % — % Term ABS 2014-1 Principal balance outstanding $ — $ 106.5 Loans pledged as collateral — 307.2 Restricted cash and cash equivalents pledged as collateral — 28.3 Interest rate — % 2.02 % Term ABS 2014-2 Principal balance outstanding $ 112.7 $ 267.6 Loans pledged as collateral 328.0 413.9 Restricted cash and cash equivalents pledged as collateral 33.6 34.9 Interest rate 2.41 % 2.10 % Term ABS 2015-1 Principal balance outstanding $ 187.1 $ 300.6 Loans pledged as collateral 305.4 374.5 Restricted cash and cash equivalents pledged as collateral 29.4 29.6 Interest rate 2.41 % 2.26 % Term ABS 2015-2 Principal balance outstanding $ 300.2 $ 300.2 Loans pledged as collateral 364.4 372.6 Restricted cash and cash equivalents pledged as collateral 31.3 28.1 Interest rate 2.63 % 2.63 % Term ABS 2016-1 Principal balance outstanding $ 385.0 $ 385.0 Loans pledged as collateral 463.3 474.0 Restricted cash and cash equivalents pledged as collateral 39.1 34.8 Interest rate 3.11 % 2.65 % Term ABS 2016-2 Principal balance outstanding $ 350.2 $ 350.2 Loans pledged as collateral 422.1 490.7 Restricted cash and cash equivalents pledged as collateral 35.3 34.4 Interest rate 2.83 % 2.83 % Term ABS 2016-3 Principal balance outstanding $ 350.0 $ 350.0 Loans pledged as collateral 448.4 489.6 Restricted cash and cash equivalents pledged as collateral 34.4 30.6 Interest rate 2.53 % 2.53 % Term ABS 2017-1 Principal balance outstanding $ 350.0 $ — Loans pledged as collateral 456.3 — Restricted cash and cash equivalents pledged as collateral 34.2 — Interest rate 2.78 % — % Term ABS 2017-2 Principal balance outstanding $ 450.0 $ — Loans pledged as collateral 572.9 — Restricted cash and cash equivalents pledged as collateral 71.3 — Interest rate 2.72 % — % 2021 Senior Notes Principal balance outstanding $ 300.0 $ 300.0 Interest rate 6.125 % 6.125 % 2023 Senior Notes Principal balance outstanding $ 250.0 $ 250.0 Interest rate 7.375 % 7.375 % (1) Availability may be limited by the amount of assets pledged as collateral.
Summary of Term ABS Financings	The table below sets forth certain additional details regarding the outstanding Term ABS financings: (Dollars in millions) Term ABS Financings Close Date Net Book Value of Loans Contributed at Closing 24 month Revolving Period Term ABS 2014-2 September 25, 2014 $ 437.6 Through September 15, 2016 Term ABS 2015-1 January 29, 2015 $ 375.9 Through January 16, 2017 Term ABS 2015-2 August 20, 2015 $ 375.5 Through August 15, 2017 Term ABS 2016-1 February 26, 2016 $ 481.4 Through February 15, 2018 Term ABS 2016-2 May 12, 2016 $ 437.8 Through May 15, 2018 Term ABS 2016-3 October 27, 2016 $ 437.8 Through October 15, 2018 Term ABS 2017-1 February 23, 2017 $ 437.8 Through February 15, 2019 Term ABS 2017-2 June 29, 2017 $ 563.2 Through June 17, 2019

Derivative and Hedging Instru30

Derivative and Hedging Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Terms of Interest Rate Cap Agreements	The following tables provide the terms of our interest rate cap agreements that were in effect as of June 30, 2017 and December 31, 2016 : (Dollars in millions) As of June 30, 2017 Facility Amount Facility Name Purpose Start End Notional Cap Interest Rate (1) $ 400.0 Warehouse Facility II Cap Floating Rate 06/2016 12/2017 $ 325.0 5.50 % 100.0 Warehouse Facility IV Cap Floating Rate 04/2016 04/2019 75.0 5.50 % Cap Floating Rate 05/2017 04/2021 25.0 6.50 % 100.0 100.0 Warehouse Facility V Cap Floating Rate 06/2015 07/2018 75.0 5.50 % 385.0 Term ABS 2016-1 Cap Floating Rate 04/2016 02/2019 385.0 5.00 % (Dollars in millions) As of December 31, 2016 Facility Amount Facility Name Purpose Start End Notional Cap Interest Rate (1) $ 400.0 Warehouse Facility II Cap Floating Rate 06/2016 12/2017 $ 325.0 5.50 % 75.0 Warehouse Facility IV Cap Floating Rate 03/2014 03/2017 18.8 5.50 % Cap Floating Rate 04/2016 04/2019 56.2 5.50 % 75.0 100.0 Warehouse Facility V Cap Floating Rate 06/2015 07/2018 75.0 5.50 % 385.0 Term ABS 2016-1 Cap Floating Rate 04/2016 02/2019 385.0 5.00 % (1) Rate excludes the spread over the LIBOR rate.

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Schedule of Related Party Loan Activity	A summary of related party Loan activity is as follows: (Dollars in millions) For the Three Months Ended June 30, 2017 2016 Affiliated Dealer activity % of consolidated Affiliated Dealer activity (2) % of consolidated (2) Dealer Loan revenue $ — — % $ 0.5 0.4 % New Consumer Loan assignments (1) — — % 3.2 0.5 % Accelerated Dealer Holdback payments — — % 0.1 0.7 % Dealer Holdback payments — — % 0.3 0.8 % (Dollars in millions) For the Six Months Ended June 30, 2017 2016 Affiliated Dealer activity % of consolidated Affiliated Dealer activity (2) % of consolidated (2) Dealer Loan revenue $ — — % $ 1.2 0.3 % New Consumer Loan assignments (1) — — % 7.5 0.5 % Accelerated Dealer Holdback payments — — % 0.2 0.7 % Dealer Holdback payments — — % 0.6 0.8 % (1) Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. (2) We have reclassified related party transactions to reflect the June 2016 sale of certain affiliated Dealers by our founder, significant shareholder and former Chairman of the Board.

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate	A reconciliation of the U.S. federal statutory rate to our effective tax rate is as follows: For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 U.S. federal statutory rate 35.0 % 35.0 % 35.0 % 35.0 % State income taxes 1.8 % 1.8 % 1.8 % 1.8 % Excess tax benefits from stock-based compensation plans — % — % -0.8 % — % Other 0.1 % 0.2 % 0.1 % 0.3 % Effective tax rate 36.9 % 37.0 % 36.1 % 37.1 %

Net Income Per Share (Tables)

Net Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of Weighted Average Shares Outstanding Basic and Diluted	The share effect is as follows: For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Weighted average shares outstanding: Common shares 19,201,560 20,159,197 19,341,193 20,094,542 Vested restricted stock units 256,595 220,360 248,400 312,837 Basic number of weighted average shares outstanding 19,458,155 20,379,557 19,589,593 20,407,379 Dilutive effect of restricted stock and restricted stock units 5,366 3,247 26,256 26,145 Dilutive number of weighted average shares outstanding 19,463,521 20,382,804 19,615,849 20,433,524

Stock Repurchases (Tables)

Stock Repurchases (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Schedule of Stock Repurchases	The following table summarizes our stock repurchases for the three and six months ended June 30, 2017 and 2016 : (Dollars in millions) For the Three Months Ended June 30, 2017 2016 Stock Repurchases Number of Shares Repurchased Cost Number of Shares Repurchased Cost Open Market (1) 81,737 $ 17.7 — $ — (Dollars in millions) For the Six Months Ended June 30, 2017 2016 Stock Repurchases Number of Shares Repurchased Cost Number of Shares Repurchased Cost Open Market (1) 588,580 $ 119.1 45,300 $ 7.6 Other (2) 21,680 4.4 170,668 33.2 Total 610,260 $ 123.5 215,968 $ 40.8 (1) Represents repurchases under authorizations by the board of directors for the repurchase of shares by us from time to time in the open market or in privately negotiated transactions. On February 13, 2017, the board of directors authorized the repurchase of up to one million shares of our common stock in addition to the board’s prior authorizations. As of June 30, 2017 , we had authorization to repurchase 776,208 shares of our common stock. (2) Represents shares of common stock released to us by team members as payment of tax withholdings upon the vesting of restricted stock and restricted stock units and the conversion of restricted stock units to common stock.

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 2017
Share-based Compensation [Abstract]
Schedule of Stock Based Compensation Expense	Stock-based compensation expense consists of the following: (In millions) For the Three Months Ended For the Six Months Ended 2017 2016 2017 2016 Restricted stock $ 0.7 $ 0.7 $ 1.4 $ 1.4 Restricted stock units 2.2 1.0 4.0 2.4 Total $ 2.9 $ 1.7 $ 5.4 $ 3.8

Description of Business (Narrat

Description of Business (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017USD ($)loanprogram
Description Of Business [Abstract]
Number of business programs | program	2
Number of consumers required to group advances	100
Number of consumer loans assigned to receive accelerated Dealer Holdback payment	100
Servicing fee percentage in collections	20.00%
One-time enrollment fee in program | $	$ 9,850
Percentage of enrollment fee of first accelerated dealer holdback payment	50.00%

Description of Business (Percen

Description of Business (Percentage of Consumer Loans Assigned with FICO Score of Less Than 650 or No FICO Score) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Percentage Of Contracts With FICO Score Lower Than 650 Or No FICO Score [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total unit volume with FICO score lower than 650 o no FICO score	0.953	0.954	0.959	0.961

Description of Business (Perc38

Description of Business (Percentage of Consumer Loans Assigned Based on Volumes) (Details)		3 Months Ended
		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume		72.30%	73.30%	76.90%	76.20%	77.80%	82.40%
Percentage of new consumer loans dollar volume	[1]	67.90%	67.80%	71.10%	68.50%	69.80%	75.60%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume		27.70%	26.70%	23.10%	23.80%	22.20%	17.60%
Percentage of new consumer loans dollar volume	[1]	32.10%	32.20%	28.90%	31.50%	30.20%	24.40%
[1]	Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. Payments of Dealer Holdback and accelerated Dealer Holdback are not included.

Summary of Significant Accoun39

Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)portfolio_segmentsegment	Dec. 31, 2016USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments | segment	1
Uninsured cash and cash equivalents	$ 26.9	$ 14.3
Number of portfolio segments | portfolio_segment	2
Period after Consumer Loan assignment that Dealer Loans written off	120 months
Period after month of purchase that Purchased Loans written off	120 months
Restricted Cash and Cash Equivalents [Member]
Summary Of Significant Accounting Policies [Line Items]
Uninsured cash and cash equivalents	$ 313.3	$ 224.1

Fair Value of Financial Instr40

Fair Value of Financial Instruments (Schedule of Comparison of the Carrying Value and Estimated Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents		$ 27.2	$ 14.6
Restricted cash and cash equivalents		313.9	224.7
Restricted securities available for sale	[1]	46.5	45.3
Loans receivable, net		4,361	3,955.9
Liabilities
Secured financing		2,489.3	2,072
Senior notes		567.1	560.5
Carrying Amount [Member]
Assets
Cash and cash equivalents		27.2	14.6
Restricted cash and cash equivalents		313.9	224.7
Restricted securities available for sale		46.5	45.3
Loans receivable, net		4,283.6	3,886.6
Liabilities
Secured financing	[1]	2,472.3	2,062.4
Senior notes	[1]	542.1	541.3
Estimated Fair Value [Member]
Assets
Cash and cash equivalents		27.2	14.6
Restricted cash and cash equivalents		313.9	224.7
Restricted securities available for sale		46.5	45.3
Loans receivable, net		4,361	3,955.9
Liabilities
Secured financing	[1]	2,489.3	2,072
Senior notes	[1]	$ 567.1	$ 560.5
[1]	Measured and recorded at fair value on a recurring basis.

Fair Value of Financial Instr41

Fair Value of Financial Instruments (Schedule of Assets and Liabilities, Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		$ 27.2	$ 14.6
Restricted cash and cash equivalents		313.9	224.7
Restricted securities available for sale	[1]	46.5	45.3
Loans receivable, net		4,361	3,955.9
Secured financing		2,489.3	2,072
Senior notes		567.1	560.5
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		27.2	14.6
Restricted cash and cash equivalents		313.9	224.7
Restricted securities available for sale	[1]	37.5	37.1
Senior notes		567.1	560.5
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted securities available for sale	[1]	9	8.2
Secured financing		2,489.3	2,072
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, net		$ 4,361	$ 3,955.9
[1]	Measured and recorded at fair value on a recurring basis.

Restricted Securities Availab42

Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Available-for-sale Securities, Amortized Cost Basis		$ 46.5	$ 45.5
Gross Unrealized Gains		0.1	0.1
Gross Unrealized Losses		(0.1)	(0.3)
Estimated Fair Value	[1]	46.5	45.3
US Government and Agency Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Available-for-sale Securities, Amortized Cost Basis		18.8	20.4
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(0.1)	(0.1)
Estimated Fair Value		18.7	20.3
Corporate Bond Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Available-for-sale Securities, Amortized Cost Basis		18.7	16.9
Gross Unrealized Gains		0.1	0.1
Gross Unrealized Losses		0	(0.2)
Estimated Fair Value		18.8	16.8
Asset-backed Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Available-for-sale Securities, Amortized Cost Basis		6.4	5
Gross Unrealized Gains		0	0
Gross Unrealized Losses		0
Estimated Fair Value		6.4	5
Mortgage-backed Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Available-for-sale Securities, Amortized Cost Basis		2.6	3.2
Gross Unrealized Gains		0	0
Gross Unrealized Losses		0	0
Estimated Fair Value		$ 2.6	$ 3.2
[1]	Measured and recorded at fair value on a recurring basis.

Restricted Securities Availab43

Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Catagory) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Estimated Fair Value, Less than 12 Months	$ 25.4	$ 33.4
Gross Unrealized Losses, Less than 12 Months	(0.1)	(0.3)
Estimated Fair Value, 12 Months or More	0	0
Gross Unrealized Losses, 12 Months or More	0	0
Total Estimated Fair Value	25.4	33.4
Total Gross Unrealized Losses	(0.1)	(0.3)
Corporate Bond Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Estimated Fair Value, Less than 12 Months	7.3	11.8
Gross Unrealized Losses, Less than 12 Months	0	(0.2)
Estimated Fair Value, 12 Months or More	0	0
Gross Unrealized Losses, 12 Months or More	0	0
Total Estimated Fair Value	7.3	11.8
Total Gross Unrealized Losses	0	(0.2)
US Government and Agency Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Estimated Fair Value, Less than 12 Months	13.4	16.4
Gross Unrealized Losses, Less than 12 Months	(0.1)	(0.1)
Estimated Fair Value, 12 Months or More	0	0
Gross Unrealized Losses, 12 Months or More	0	0
Total Estimated Fair Value	13.4	16.4
Total Gross Unrealized Losses	(0.1)	(0.1)
Asset-backed Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Estimated Fair Value, Less than 12 Months	3	2.8
Gross Unrealized Losses, Less than 12 Months	0
Estimated Fair Value, 12 Months or More	0	0
Gross Unrealized Losses, 12 Months or More	0	0
Total Estimated Fair Value	3	2.8
Mortgage-backed Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Estimated Fair Value, Less than 12 Months	1.7	2.4
Estimated Fair Value, 12 Months or More	0	0
Gross Unrealized Losses, 12 Months or More	0	0
Total Estimated Fair Value	$ 1.7	$ 2.4

Restricted Securities Availab44

Restricted Securities Available for Sale (Schedule of Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Within one year, cost		$ 0.8	$ 1.6
Within one year, fair value		0.8	1.6
Over one year to five years, cost		39.7	39.3
Over one year to five years, fair value		39.7	39.1
Over five years to ten years, cost		3.5	2.2
Over five years to ten years, fair value		3.5	2.2
Over ten years, cost		2.5	2.4
Over ten years, fair value		2.5	2.4
Total restricted securities available for sale, cost		46.5	45.5
Total restricted securities available for sale	[1]	$ 46.5	$ 45.3
[1]	Measured and recorded at fair value on a recurring basis.

Loans Receivable (Narrative) (D

Loans Receivable (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Age of Consumer Loans contractual payments due with no forecasted future net cash flows	120 months

Loans Receivable (Schedule of L

Loans Receivable (Schedule of Loans Receivable) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,637.7	$ 4,474	$ 4,207	$ 3,812	$ 3,626.2	$ 3,345.1
Allowance for credit losses	(354.1)	(338)	(320.4)	(276.9)	(262.8)	(243.6)
Loans receivable, net	4,283.6		3,886.6
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,385.3	3,326.5	3,209	3,049.2	2,985.7	2,823.4
Allowance for credit losses	(336.9)	(323.8)	(309.3)	(268.2)	(254)	(235.1)
Loans receivable, net	3,048.4		2,899.7
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,252.4	1,147.5	998	762.8	640.5	521.7
Allowance for credit losses	(17.2)	$ (14.2)	(11.1)	$ (8.7)	$ (8.8)	$ (8.5)
Loans receivable, net	$ 1,235.2		$ 986.9

Loans Receivable (Summary of Ch

Loans Receivable (Summary of Changes in Loans Receivable) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Loans and Leases Receivable, Net [Roll Forward]
Balance, beginning of period		$ 4,474		$ 3,626.2		$ 4,207		$ 3,345.1
New Consumer Loan assignments	[1]	671.8		627.4		1,463.3		1,371.5
Principal collected on Loans receivable		(549.3)		(488.6)		(1,116.3)		(1,003.4)
Accelerated Dealer Holdback payments		(13.4)		(14.9)		(23.6)		(29.7)
Dealer Holdback payments		33.5		35.9		68.7		75.8
Write-offs		(6.2)		(4.2)		(9.4)		(7.4)
Recoveries	[2],[3]	0.5		0.4		0.8		0.7
Balance, end of period		4,637.7		3,812		4,637.7		3,812
Dealer Loans [Member]
Loans and Leases Receivable, Net [Roll Forward]
Balance, beginning of period		3,326.5		2,985.7		3,209		2,823.4
New Consumer Loan assignments	[1]	456.3		438		993.2		1,000.7
Principal collected on Loans receivable		(438.2)		(420.5)		(899.2)		(871.3)
Accelerated Dealer Holdback payments		(13.4)		(14.9)		(23.6)		(29.7)
Dealer Holdback payments		33.5		35.9		68.7		75.8
Transfers	[4]	(1.1)		(1.1)		2.2		2.5
Write-offs		(5.5)		(4.1)		(8.5)		(7.3)
Recoveries	[2],[3]	0.4		0.4		0.7		0.7
Balance, end of period		3,385.3		3,049.2		3,385.3		3,049.2
Purchased Loans [Member]
Loans and Leases Receivable, Net [Roll Forward]
Balance, beginning of period		1,147.5		640.5		998		521.7
New Consumer Loan assignments	[1]	215.5		189.4		470.1		370.8
Principal collected on Loans receivable		(111.1)		(68.1)		(217.1)		(132.1)
Transfers	[4]	1.1		1.1		(2.2)		(2.5)
Write-offs		(0.7)		(0.1)		(0.9)		(0.1)
Recoveries	[3]	0.1	[2]	0	[2]	0.1	[2]	0
Balance, end of period		$ 1,252.4		$ 762.8		$ 1,252.4		$ 762.8
[1]	The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program.
[2]	Represents collections received on previously written off Loans.
[3]	Represents collections received on previously written off Loans.
[4]	Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance to Purchased Loans in the period this forfeiture occurs.

Loans Receivable (Summary of 48

Loans Receivable (Summary of Changes in Accretable Yield) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Loans Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period		$ 1,442.7	$ 1,185.2	$ 1,330.7	$ 1,072.8
New Consumer Loan assignments	[1]	275.3	253.9	598.4	555.3
Accretion	[2]	(253.9)	(217.4)	(494.1)	(422.5)
Provision for credit losses		21.8	17.9	42.3	40
Forecast changes		8.8	6.5	16.9	(0.2)
Transfers	[3]	0.1	0.4	0.6	1.1
Balance, end of period		1,494.8	1,246.5	1,494.8	1,246.5
Dealer Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Loans Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period		1,028.1	946.6	982.6	874.2
New Consumer Loan assignments	[1]	186.8	183.6	406.5	417.7
Accretion	[2]	(193)	(180.4)	(380.8)	(354.1)
Provision for credit losses		18.2	17.9	35.4	39.7
Forecast changes		(1.5)	(3.9)	(4.9)	(13.5)
Transfers	[3]	(0.2)	(0.6)	(0.4)	(0.8)
Balance, end of period		1,038.4	963.2	1,038.4	963.2
Purchased Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Loans Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period		414.6	238.6	348.1	198.6
New Consumer Loan assignments	[1]	88.5	70.3	191.9	137.6
Accretion	[2]	(60.9)	(37)	(113.3)	(68.4)
Provision for credit losses		3.6	0	6.9	0.3
Forecast changes		10.3	10.4	21.8	13.3
Transfers	[3]	0.3	1	1	1.9
Balance, end of period		$ 456.4	$ 283.3	$ 456.4	$ 283.3
[1]	The Dealer Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related advances paid to Dealers. The Purchased Loans amount represents the net cash flows expected at the time of assignment on Consumer Loans assigned under our Purchase Program, less the related one-time payments made to Dealers.
[2]	Represents finance charges excluding the amortization of deferred direct origination costs for Dealer Loans.
[3]	Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance and related expected future net cash flows to Purchased Loans in the period this forfeiture occurs.

Loans Receivable (Summary of In

Loans Receivable (Summary of Information Related to New Consumer Loan Assignments) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual net cash flows at the time of assignment	[1]	$ 1,190.9	$ 1,081.5	$ 2,596.5	$ 2,338.2
Expected net cash flows at the time of assignment	[2]	947.1	881.3	2,061.7	1,926.8
Fair value at the time of assignment	[3]	671.8	627.4	1,463.3	1,371.5
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual net cash flows at the time of assignment	[1]	726	698.6	1,580.5	1,588.7
Expected net cash flows at the time of assignment	[2]	643.1	621.6	1,399.7	1,418.4
Fair value at the time of assignment	[3]	456.3	438	993.2	1,000.7
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual net cash flows at the time of assignment	[1]	464.9	382.9	1,016	749.5
Expected net cash flows at the time of assignment	[2]	304	259.7	662	508.4
Fair value at the time of assignment	[3]	$ 215.5	$ 189.4	$ 470.1	$ 370.8
[1]	The Dealer Loans amount represents the repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related Dealer Holdback payments that we would be required to make if we collected all of the contractual repayments. The Purchased Loans amount represents the repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under our Purchase Program.
[2]	The Dealer Loans amount represents the repayments that we expected to collect at the time of assignment on Consumer Loans assigned under our Portfolio Program, less the related Dealer Holdback payments that we expected to make. The Purchased Loans amount represents the repayments that we expected to collect at the time of assignment on Consumer Loans assigned under our Purchase Program.
[3]	The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program.

Loans Receivable (Schedule of C

Loans Receivable (Schedule of Consumer Loans Forecasted Collection Percentage) (Details)		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Loans Originating In 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	70.50%	70.40%	70.40%
Initial Forecasted Collection Percentage	[1]											69.70%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.10%
Variance In Forecasted Collection Percentage from Prior Year End				0.10%
Variance In Initial Forecasted Collection Percentage												0.80%
Loans Originating In 2009 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	79.50%	79.40%	79.40%
Initial Forecasted Collection Percentage	[1]										71.90%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.10%
Variance In Forecasted Collection Percentage from Prior Year End				0.10%
Variance In Initial Forecasted Collection Percentage											7.60%
Loans Originating In 2010 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	77.60%	77.60%	77.60%
Initial Forecasted Collection Percentage	[1]									73.60%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.00%
Variance In Forecasted Collection Percentage from Prior Year End				0.00%
Variance In Initial Forecasted Collection Percentage										4.00%
Loans Originating In 2011 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	74.80%	74.70%	74.70%
Initial Forecasted Collection Percentage	[1]								72.50%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.10%
Variance In Forecasted Collection Percentage from Prior Year End				0.10%
Variance In Initial Forecasted Collection Percentage									2.30%
Loans Originating In 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	73.80%	73.80%	73.70%
Initial Forecasted Collection Percentage	[1]							71.40%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.00%
Variance In Forecasted Collection Percentage from Prior Year End				0.10%
Variance In Initial Forecasted Collection Percentage								2.40%
Loans Originating In 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	73.50%	73.40%	73.40%
Initial Forecasted Collection Percentage	[1]						72.00%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.10%
Variance In Forecasted Collection Percentage from Prior Year End				0.10%
Variance In Initial Forecasted Collection Percentage							1.50%
Loans Originating In 2014 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	71.70%	71.70%	71.80%
Initial Forecasted Collection Percentage	[1]					71.80%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.00%
Variance In Forecasted Collection Percentage from Prior Year End				(0.10%)
Variance In Initial Forecasted Collection Percentage						(0.10%)
Loans Originating In 2015 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	65.70%	65.80%	66.10%
Initial Forecasted Collection Percentage	[1]				67.70%
Variance In Forecasted Collection Percentage from Prior Quarter End			(0.10%)
Variance In Forecasted Collection Percentage from Prior Year End				(0.40%)
Variance In Initial Forecasted Collection Percentage					(2.00%)
Loans Originating In 2016 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	65.10%	65.30%	65.10%
Initial Forecasted Collection Percentage	[1]			65.40%
Variance In Forecasted Collection Percentage from Prior Quarter End			(0.20%)
Variance In Forecasted Collection Percentage from Prior Year End				0.00%
Variance In Initial Forecasted Collection Percentage				(0.30%)
Loans Originating In 2017 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	65.50%	64.90%
Initial Forecasted Collection Percentage	[1]	64.20%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.60%
Variance In Initial Forecasted Collection Percentage		1.30%
LoansOriginatingInCurrentYearPriorQuarters [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage		65.50%	64.90%
Initial Forecasted Collection Percentage			64.00%
Variance In Forecasted Collection Percentage from Prior Quarter End			0.60%
Variance In Initial Forecasted Collection Percentage			1.50%
LoansOriginatinginCurrentYearCurrentQuarter [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage		65.40%
Initial Forecasted Collection Percentage		64.40%
Variance In Initial Forecasted Collection Percentage		1.00%
[1]	Represents the total forecasted collections we expect to collect on the Consumer Loans as a percentage of the repayments that we were contractually owed on the Consumer Loans at the time of assignment. Contractual repayments include both principal and interest. Forecasted collection rates are negatively impacted by canceled Consumer Loans as the contractual amount owed is not removed from the denominator for purposes of computing forecasted collection rates in the table.

Loans Receivable (Schedule of51

Loans Receivable (Schedule of Consumer Loans Performance) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,637.7	$ 4,474	$ 4,207	$ 3,812	$ 3,626.2	$ 3,345.1
Allowance for credit losses	(354.1)	(338)	(320.4)	(276.9)	(262.8)	(243.6)
Loans receivable, net	4,283.6		3,886.6
Loan Pool Performance Meets Or Exceeds Initial Estimates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,789.6		1,708
Loans receivable, net	1,789.6		1,708
Loan Pool Performance Less Than Initial Estimates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,848.1		2,499
Allowance for credit losses	(354.1)		(320.4)
Loans receivable, net	2,494		2,178.6
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,385.3	3,326.5	3,209	3,049.2	2,985.7	2,823.4
Allowance for credit losses	(336.9)	(323.8)	(309.3)	(268.2)	(254)	(235.1)
Loans receivable, net	3,048.4		2,899.7
Dealer Loans [Member] | Loan Pool Performance Meets Or Exceeds Initial Estimates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,104.6		1,002.2
Loans receivable, net	1,104.6		1,002.2
Dealer Loans [Member] | Loan Pool Performance Less Than Initial Estimates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,280.7		2,206.8
Allowance for credit losses	(336.9)		(309.3)
Loans receivable, net	1,943.8		1,897.5
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,252.4	1,147.5	998	762.8	640.5	521.7
Allowance for credit losses	(17.2)	$ (14.2)	(11.1)	$ (8.7)	$ (8.8)	$ (8.5)
Loans receivable, net	1,235.2		986.9
Purchased Loans [Member] | Loan Pool Performance Meets Or Exceeds Initial Estimates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	685		705.8
Loans receivable, net	685		705.8
Purchased Loans [Member] | Loan Pool Performance Less Than Initial Estimates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	567.4		292.2
Allowance for credit losses	(17.2)		(11.1)
Loans receivable, net	$ 550.2		$ 281.1

Loans Receivable (Summary of 52

Loans Receivable (Summary of Changes In Allowance for Credit Losses) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		$ 338		$ 262.8		$ 320.4		$ 243.6
Provision for credit losses		21.8		17.9		42.3		40
Write-offs		(6.2)		(4.2)		(9.4)		(7.4)
Recoveries	[1],[2]	0.5		0.4		0.8		0.7
Balance, end of period		354.1		276.9		354.1		276.9
Dealer Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		323.8		254		309.3		235.1
Provision for credit losses		18.2		17.9		35.4		39.7
Write-offs		(5.5)		(4.1)		(8.5)		(7.3)
Recoveries	[1],[2]	0.4		0.4		0.7		0.7
Balance, end of period		336.9		268.2		336.9		268.2
Purchased Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period		14.2		8.8		11.1		8.5
Provision for credit losses		3.6		0		6.9		0.3
Write-offs		(0.7)		(0.1)		(0.9)		(0.1)
Recoveries	[2]	0.1	[1]	0	[1]	0.1	[1]	0
Balance, end of period		$ 17.2		$ 8.7		$ 17.2		$ 8.7
[1]	Represents collections received on previously written off Loans.
[2]	Represents collections received on previously written off Loans.

Reinsurance Reinsurance (Summar

Reinsurance Reinsurance (Summary of Reinsurance Activity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Insurance [Abstract]
Net assumed written premiums	$ 9.6	$ 9	$ 21.9	$ 20.9
Net premiums earned	10.5	10.9	20.6	21.7
Provision for claims	6.1	7	12.1	13.8
Amortization of capitalized acquisition costs	$ 0.2	$ 0.3	$ 0.5	$ 0.5

Reinsurance Reinsurance (Schedu

Reinsurance Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		$ 313.9	$ 224.7
Restricted securities available for sale	[1]	46.5	45.3
Accounts payable and accrued liabilities		140.4	143.9
Trust Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		0.6	0.5
Restricted securities available for sale		46.5	45.3
Unearned Premium [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities		34.1	32.8
Claims Reserve [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	[2]	$ 1.2	$ 1
[1]	Measured and recorded at fair value on a recurring basis.
[2]	The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($)		Mar. 30, 2015	Feb. 21, 2014	Jan. 22, 2014	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Maximum hedging reserve					$ 1,000,000
Debt facility financing amount					$ 3,035,200,000	$ 2,622,100,000
Percentage of collections on contributed loans					6.00%
Monthly servicing fee per financing					6.00%
Debt covenants					$ 1
Unamortized debt discount					1,400,000	$ 1,600,000
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility	[1]				$ 345,000,000
Percentage of net book value of loans					0.00%
Wholly-owned Subsidiary					n/a
Revolving Secured Line of Credit 2019 [Member]
Debt Instrument [Line Items]
Line of credit facility					$ 300,000,000
Warehouse Facilities [Member]
Debt Instrument [Line Items]
Percentage of net book value of loans					80.00%
Number of warehouse facilities					4
Debt facility financing amount					$ 675,000,000
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2],[3]				$ 400,000,000
Wholly-owned Subsidiary	[2]				CAC Warehouse Funding Corp. II
Debt maturity date	[2],[4]				Jun. 23, 2019
Senior notes yield to maturity					0.00%	0.00%
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2],[3]				$ 100,000,000
Wholly-owned Subsidiary	[2]				CAC Warehouse Funding LLC IV
Debt maturity date	[2],[4]				Apr. 30, 2020
Senior notes yield to maturity					0.00%	2.77%
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2],[3]				$ 100,000,000
Wholly-owned Subsidiary	[2]				CAC Warehouse Funding LLC V
Debt maturity date	[2],[5]				Aug. 18, 2019
Senior notes yield to maturity					0.00%	0.00%
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2]				$ 75,000,000
Wholly-owned Subsidiary	[2]				CAC Warehouse Funding LLC VI
Debt maturity date	[2],[4]				Sep. 30, 2018
Senior notes yield to maturity					0.00%	0.00%
2017 Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes stated interest rate			9.125%
Repayment of senior notes			$ 350,000,000
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Debt facility financing amount				$ 300,000,000	$ 300,000,000
Wholly-owned Subsidiary					n/a
Close date, secured financings				Jan. 22, 2014
Senior notes stated interest rate				6.125%
Debt maturity date				Feb. 15, 2021	Feb. 15, 2021
Senior notes yield to maturity					6.125%	6.125%
2023 Senior Notes [Member]
Debt Instrument [Line Items]
Debt facility financing amount		$ 250,000,000			$ 250,000,000
Wholly-owned Subsidiary					n/a
Close date, secured financings		Mar. 30, 2015
Senior notes stated interest rate		7.375%
Debt maturity date		Mar. 15, 2023			Mar. 15, 2023
Redemption price, percentage of principal amount redeemed		99.266%
Proceeds from issuance of senior notes		$ 248,200,000
Senior notes yield to maturity		7.50%			7.375%	7.375%
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2]				$ 349,000,000
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2014-2
Debt financing close date					Sep. 25, 2014
Debt maturity date	[2],[4]				Sep. 15, 2016
Senior notes yield to maturity					2.41%	2.10%
Net Book Value Of Loans Pledged As Collateral					$ 437,600,000
Term ABS 2015-1 [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2]				$ 300,600,000
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2015-1
Debt financing close date					Jan. 29, 2015
Debt maturity date	[2],[4]				Jan. 16, 2017
Senior notes yield to maturity					2.41%	2.26%
Net Book Value Of Loans Pledged As Collateral					$ 375,900,000
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2]				$ 300,200,000
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2015-2
Debt financing close date					Aug. 20, 2015
Debt maturity date	[2],[4]				Aug. 15, 2017
Senior notes yield to maturity					2.63%	2.63%
Net Book Value Of Loans Pledged As Collateral					$ 375,500,000
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2],[3]				$ 385,000,000
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2016-1
Debt financing close date					Feb. 26, 2016
Debt maturity date	[2],[4]				Feb. 15, 2018
Senior notes yield to maturity					3.11%	2.65%
Net Book Value Of Loans Pledged As Collateral					$ 481,400,000
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2]				$ 350,200,000
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2016-2
Debt financing close date					May 12, 2016
Debt maturity date	[2],[4]				May 15, 2018
Senior notes yield to maturity					2.83%	2.83%
Net Book Value Of Loans Pledged As Collateral					$ 437,800,000
Term ABS 2016-3 [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2]				$ 350,000,000
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2016-3
Debt financing close date					Oct. 27, 2016
Debt maturity date	[2],[4]				Oct. 15, 2018
Senior notes yield to maturity					2.53%	2.53%
Net Book Value Of Loans Pledged As Collateral					$ 437,800,000
Term ABS 2017-1 [Member]
Debt Instrument [Line Items]
Debt facility financing amount	[2]				$ 350,000,000
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2017-1
Debt financing close date					Feb. 23, 2017
Debt maturity date	[2],[4]				Feb. 15, 2019
Senior notes yield to maturity					2.78%	0.00%
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
Wholly-owned Subsidiary	[2]				Credit Acceptance Funding LLC 2017-2
Debt financing close date					Jun. 29, 2017
Debt maturity date	[2],[4]				Jun. 17, 2019
Senior notes yield to maturity					2.72%	0.00%
Net Book Value Of Loans Pledged As Collateral					$ 563,200,000
[1]	The amount of the facility will decrease to $300.0 million on June 22, 2019.
[2]	Financing made available only to a specified subsidiary of the Company.
[3]	Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[4]	Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[5]	Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on August 18, 2021 will be due on that date.

Debt Debt (Schedule of Principa

Debt Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt facility financing amount	$ 3,035.2	$ 2,622.1
Deferred Debt Issuance Costs	(19.4)	(16.8)
Unamortized debt discount	(1.4)	(1.6)
Carrying Amount	3,014.4	2,603.7
Secured financings [Member]
Debt Instrument [Line Items]
Debt facility financing amount	2,485.2	2,072.1
Deferred Debt Issuance Costs	(12.9)	(9.7)
Unamortized debt discount	0	0
Carrying Amount	2,472.3	2,062.4
Senior Notes [Member]
Debt Instrument [Line Items]
Debt facility financing amount	550	550
Deferred Debt Issuance Costs	(6.5)	(7.1)
Unamortized debt discount	(1.4)	(1.6)
Carrying Amount	$ 542.1	$ 541.3

Debt (Schedule of General Infor

Debt (Schedule of General Information of Financing Transaction) (Details) - USD ($)		Mar. 30, 2015	Jan. 22, 2014	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt facility financing amount				$ 3,035,200,000	$ 2,622,100,000
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary				n/a
Line of credit maturity date				Jun. 22, 2020
Financing Amount	[1]			$ 345,000,000
Revolving Secured Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.875%
Revolving Secured Line of Credit [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				0.875%
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			CAC Warehouse Funding Corp. II
Debt maturity date	[2],[3]			Jun. 23, 2019
Debt facility financing amount	[2],[4]			$ 400,000,000
Warehouse Facility II [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	[2],[3]			2.25%
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			CAC Warehouse Funding LLC IV
Debt maturity date	[2],[3]			Apr. 30, 2020
Debt facility financing amount	[2],[4]			$ 100,000,000
Warehouse Facility IV [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	[2],[3]			2.25%
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			CAC Warehouse Funding LLC V
Debt maturity date	[2],[5]			Aug. 18, 2019
Debt facility financing amount	[2],[4]			$ 100,000,000
Warehouse Facility V [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	[2],[3]			2.25%
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			CAC Warehouse Funding LLC VI
Debt maturity date	[2],[3]			Sep. 30, 2018
Debt facility financing amount	[2]			$ 75,000,000
Warehouse Facility VI [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	[2],[3]			2.00%
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2014-2
Debt maturity date	[2],[3]			Sep. 15, 2016
Debt facility financing amount	[2]			$ 349,000,000
Term ABS 2015-1 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2015-1
Debt maturity date	[2],[3]			Jan. 16, 2017
Debt facility financing amount	[2]			$ 300,600,000
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2015-2
Debt maturity date	[2],[3]			Aug. 15, 2017
Debt facility financing amount	[2]			$ 300,200,000
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2016-1
Debt maturity date	[2],[3]			Feb. 15, 2018
Debt facility financing amount	[2],[4]			$ 385,000,000
Term ABS 2016-1 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	[2],[3]			1.95%
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2016-2
Debt maturity date	[2],[3]			May 15, 2018
Debt facility financing amount	[2]			$ 350,200,000
Term ABS 2016-3 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2016-3
Debt maturity date	[2],[3]			Oct. 15, 2018
Debt facility financing amount	[2]			$ 350,000,000
Term ABS 2017-1 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2017-1
Debt maturity date	[2],[3]			Feb. 15, 2019
Debt facility financing amount	[2]			$ 350,000,000
Term ABS 2017-2 [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary	[2]			Credit Acceptance Funding LLC 2017-2
Debt maturity date	[2],[3]			Jun. 17, 2019
Debt facility financing amount	[2]			$ 450,000,000
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary				n/a
Debt maturity date			Feb. 15, 2021	Feb. 15, 2021
Debt facility financing amount			$ 300,000,000	$ 300,000,000
2023 Senior Notes [Member]
Debt Instrument [Line Items]
Wholly-owned Subsidiary				n/a
Debt maturity date		Mar. 15, 2023		Mar. 15, 2023
Debt facility financing amount		$ 250,000,000		$ 250,000,000
[1]	The amount of the facility will decrease to $300.0 million on June 22, 2019.
[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 August 18, 2021 will be due on that date.

Debt (Schedule of Additional In

Debt (Schedule of Additional Information Related to Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 276.7	$ 123.7	$ 276.7	$ 186.4
Average outstanding balance	178.8	22.2	120.9	39.4
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	263.4	200.1	263.4	200.1
Average outstanding balance	5.8	6.6	5.1	5.5
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	12	12	12	12
Average outstanding balance	11.6	12	11.8	12
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	100	100	100	100
Average outstanding balance	28.9	3.3	15.6	2.1
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	75	49.9	75	49.9
Average outstanding balance	$ 28.4	$ 1.6	$ 14.8	$ 6

Debt (Summary of Debt) (Details

Debt (Summary of Debt) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016	Mar. 30, 2015
Debt Instrument [Line Items]
Balance outstanding		$ 2,472.3	$ 2,062.4
Balance outstanding		542.1	541.3
Restricted cash and cash equivalents pledged as collateral		313.9	224.7
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Balance outstanding		0	0
Amount available for borrowing	[1]	$ 345	$ 310
Interest rate		0.00%	0.00%
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0	$ 0
Amount available for borrowing	[1]	400	400
Loans pledged as collateral		0	0
Restricted cash and cash equivalents pledged as collateral		$ 2.7	$ 1.5
Senior notes yield to maturity		0.00%	0.00%
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0	$ 12
Amount available for borrowing	[1]	100	63
Loans pledged as collateral		0	23
Restricted cash and cash equivalents pledged as collateral		$ 0.1	$ 0.9
Senior notes yield to maturity		0.00%	2.77%
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0	$ 0
Amount available for borrowing	[1]	100	100
Loans pledged as collateral		0	0
Restricted cash and cash equivalents pledged as collateral		$ 1.1	$ 1
Senior notes yield to maturity		0.00%	0.00%
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0	$ 0
Amount available for borrowing	[1]	75	75
Loans pledged as collateral		0
Restricted cash and cash equivalents pledged as collateral		$ 0.8	$ 0.1
Senior notes yield to maturity		0.00%	0.00%
Term ABS 2014-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0	$ 106.5
Loans pledged as collateral		0	307.2
Restricted cash and cash equivalents pledged as collateral		$ 0	$ 28.3
Senior notes yield to maturity		0.00%	2.02%
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 112.7	$ 267.6
Loans pledged as collateral		328	413.9
Restricted cash and cash equivalents pledged as collateral		$ 33.6	$ 34.9
Senior notes yield to maturity		2.41%	2.10%
Term ABS 2015-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 187.1	$ 300.6
Loans pledged as collateral		305.4	374.5
Restricted cash and cash equivalents pledged as collateral		$ 29.4	$ 29.6
Senior notes yield to maturity		2.41%	2.26%
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 300.2	$ 300.2
Loans pledged as collateral		364.4	372.6
Restricted cash and cash equivalents pledged as collateral		$ 31.3	$ 28.1
Senior notes yield to maturity		2.63%	2.63%
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 385	$ 385
Loans pledged as collateral		463.3	474
Restricted cash and cash equivalents pledged as collateral		$ 39.1	$ 34.8
Senior notes yield to maturity		3.11%	2.65%
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 350.2	$ 350.2
Loans pledged as collateral		422.1	490.7
Restricted cash and cash equivalents pledged as collateral		$ 35.3	$ 34.4
Senior notes yield to maturity		2.83%	2.83%
Term ABS 2016-3 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 350	$ 350
Loans pledged as collateral		448.4	489.6
Restricted cash and cash equivalents pledged as collateral		$ 34.4	$ 30.6
Senior notes yield to maturity		2.53%	2.53%
Term ABS 2017-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 350	$ 0
Loans pledged as collateral		456.3	0
Restricted cash and cash equivalents pledged as collateral		$ 34.2	$ 0
Senior notes yield to maturity		2.78%	0.00%
Term ABS 2017-2 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 450	$ 0
Loans pledged as collateral		572.9	0
Restricted cash and cash equivalents pledged as collateral		$ 71.3	$ 0
Senior notes yield to maturity		2.72%	0.00%
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 300	$ 300
Senior notes yield to maturity		6.125%	6.125%
2023 Senior Notes [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 250	$ 250
Senior notes yield to maturity		7.375%	7.375%	7.50%
[1]	Availability may be limited by the amount of assets pledged as collateral.

Debt (Summary of Term ABS Finan

Debt (Summary of Term ABS Financings) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Term ABS 2013-1 [Member]
Debt Instrument [Line Items]
Maturity Date	Apr. 15, 2015
Term ABS 2013-2 [Member]
Debt Instrument [Line Items]
Maturity Date	Oct. 15, 2015
Term ABS 2014-1 [Member]
Debt Instrument [Line Items]
Maturity Date	Apr. 15, 2016
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Close Date	Sep. 25, 2014
Net Book Value of Loans Contributed at Closing	$ 437.6
Maturity Date	Sep. 15, 2016	[1],[2]
Term ABS 2015-1 [Member]
Debt Instrument [Line Items]
Close Date	Jan. 29, 2015
Net Book Value of Loans Contributed at Closing	$ 375.9
Maturity Date	Jan. 16, 2017	[1],[2]
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Close Date	Aug. 20, 2015
Net Book Value of Loans Contributed at Closing	$ 375.5
Maturity Date	Aug. 15, 2017	[1],[2]
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Close Date	Feb. 26, 2016
Net Book Value of Loans Contributed at Closing	$ 481.4
Maturity Date	Feb. 15, 2018	[1],[2]
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Close Date	May 12, 2016
Net Book Value of Loans Contributed at Closing	$ 437.8
Maturity Date	May 15, 2018	[1],[2]
Term ABS 2016-3 [Member]
Debt Instrument [Line Items]
Close Date	Oct. 27, 2016
Net Book Value of Loans Contributed at Closing	$ 437.8
Maturity Date	Oct. 15, 2018	[1],[2]
Term ABS 2017-1 [Member]
Debt Instrument [Line Items]
Close Date	Feb. 23, 2017
Net Book Value of Loans Contributed at Closing	$ 437.8
Maturity Date	Feb. 15, 2019	[1],[2]
Term ABS 2017-2 [Member]
Debt Instrument [Line Items]
Close Date	Jun. 29, 2017
Net Book Value of Loans Contributed at Closing	$ 563.2
Maturity Date	Jun. 17, 2019	[1],[2]
[1]	Financing made available only to a specified subsidiary of the Company.
[2]	Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.

Derivative and Hedging Instru61

Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) (Details) - USD ($)		Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Debt facility financing amount		$ 3,035,200,000	$ 2,622,100,000
Interest rate caps, fair value of less than $0.1 million		100,000	100,000
Warehouse Facility II [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	400,000,000
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		400,000,000	400,000,000
Notional		$ 325,000,000	$ 325,000,000
Cap Interest Rate	[3]	5.50%	5.50%
Warehouse Facility IV [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	$ 100,000,000
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate Original [Member]
Derivative [Line Items]
Notional		$ 75,000,000	$ 18,800,000
Cap Interest Rate	[3]	5.50%	5.50%
Warehouse Facility IV [Member] | Additional Interest Rate Cap [Member]
Derivative [Line Items]
Notional		$ 25,000,000	$ 56,200,000
Cap Interest Rate	[3]	6.50%	5.50%
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		$ 100,000,000	$ 75,000,000
Notional		100,000,000	75,000,000
Warehouse Facility V [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	100,000,000
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		100,000,000	100,000,000
Notional		$ 75,000,000	$ 75,000,000
Cap Interest Rate	[3]	5.50%	5.50%
Term ABS 2016-1 [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	$ 385,000,000
Term ABS 2016-1 [Member] | 5.00% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		385,000,000	$ 385,000,000
Notional		$ 385,000,000	$ 385,000,000
Cap Interest Rate	[3]	5.00%	5.00%
[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]	Rate excludes the spread over the LIBOR rate.

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Affiliated Dealer Loan balances		$ 0		$ 0		$ 1.4
Percentage of Affiliated Dealer Loan balances		0.00%		0.00%		0.00%
New Consumer Loan assignments				$ 993.2	$ 1,000.7
Accelerated Dealer Holdback payments		$ 13.4	$ 14.9	23.6	29.7
Dealer Holdback payments		33.5	35.9	68.7	75.8
Affiliated Dealer Activity [Member]
Related Party Transaction [Line Items]
Dealer Loan revenue		$ 0	$ 0.5	$ 0	$ 1.2
Dealer Loan revenue, percentage		0.00%	0.40%	0.00%	0.30%
New Consumer Loan assignments	[1]	$ 0	$ 3.2	$ 0	$ 7.5
New Consumer Loan assignments, percentage	[1]	0.00%	0.50%	0.00%	0.50%
Accelerated Dealer Holdback payments		$ 0	$ 0.1	$ 0	$ 0.2
Accelerated Dealer Holdback payments, percentage		0.00%	0.70%	0.00%	0.70%
Dealer Holdback payments		$ 0	$ 0.3	$ 0	$ 0.6
Dealer Holdback payments, percentage		0.00%	0.80%	0.00%	0.80%
[1]	Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program.

Income Taxes (Schedule of Recon

Income Taxes (Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	35.00%	35.00%	35.00%	35.00%
State income taxes	1.80%	1.80%	1.80%	1.80%
Excess tax benefits from stock-based compensation plans	(0.00%)	(0.00%)	(0.80%)	(0.00%)
Other	0.10%	0.20%	0.10%	0.30%
Effective tax rate	36.90%	37.00%	36.10%	37.10%

Net Income Per Share (Computati

Net Income Per Share (Computation of Weighted Average Shares Outstanding Basic and Diluted) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Common shares	19,201,560	20,159,197	19,341,193	20,094,542
Vested restricted stock units	256,595	220,360	248,400	312,837
Basic number of weighted average shares outstanding	19,458,155	20,379,557	19,589,593	20,407,379
Dilutive effect of restricted stock and restricted stock units	5,366	3,247	26,256	26,145
Dilutive number of weighted average shares outstanding	19,463,521	20,382,804	19,615,849	20,433,524
Shares outstanding excluded from calculation of diluted net income per share	0	0	8,439	7,426

Stock Repurchases (Details)

Stock Repurchases (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Nov. 23, 2015
Equity, Class of Treasury Stock [Line Items]
Increase in number of shares authorized for repurchase						1,000,000
Remaining number of shares authorized for repurchase		776,208		776,208
Common stock repurchased, shares				610,260	215,968
Common stock repurchased, value				$ 123.5	$ 40.8
Open Market [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased, shares	[1]	81,737	0	588,580	45,300
Common stock repurchased, value	[1]	$ 17.7	$ 0	$ 119.1	$ 7.6
Other [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased, shares	[2]			21,680	170,668
Common stock repurchased, value	[2]			$ 4.4	$ 33.2
[1]	Represents repurchases under authorizations by the board of directors for the repurchase of shares by us from time to time in the open market or in privately negotiated transactions. On February 13, 2017, the board of directors authorized the repurchase of up to one million shares of our common stock in addition to the board’s prior authorizations. As of June 30, 2017, we had authorization to repurchase 776,208 shares of our common stock.
[2]	Represents shares of common stock released to us by team members as payment of tax withholdings upon the vesting of restricted stock and restricted stock units and the conversion of restricted stock units to common stock.

Stock-Based Compensation Plan66

Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2.9	$ 1.7	$ 5.4	$ 3.8
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0.7	0.7	1.4	1.4
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2.2	$ 1	$ 4	$ 2.4

Uncategorized Items - cacc-2017

Label	Element	Value
Gain (Loss) on Disposition of Property Plant Equipment	us-gaap_GainLossOnSaleOfPropertyPlantEquipment	$ 0