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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		$ 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	$ 0.5	$ 0.0	$ 1.2
Dealer Loan revenue, percentage		0.00%	0.40%	0.00%	0.30%
New Consumer Loan assignments	[1]	$ 0.0	$ 3.2	$ 0.0	$ 7.5
New Consumer Loan assignments, percentage	[1]	0.00%	0.50%	0.00%	0.50%
Accelerated Dealer Holdback payments		$ 0.0	$ 0.1	$ 0.0	$ 0.2
Accelerated Dealer Holdback payments, percentage		0.00%	0.70%	0.00%	0.70%
Dealer Holdback payments		$ 0.0	$ 0.3	$ 0.0	$ 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.

X

- Definition

The cash outflow for payments made to dealers under our Portfolio Program at the time a pool of 100 or more consumer loans is closed by dealers with a single open pool or at the time 100 consumer loans have been collectively assigned by dealers with multiple open pools.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow for non-recourse payments made to dealers under a portfolio program in exchange for the right to service the underlying consumer loans.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow for payments made to dealers under our Portfolio Program from the portion of the collections on the underlying consumer loans that exceed amounts retained by us to recover the advance balance, certain collection costs, and our servicing fee.

+ References

No definition available.

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X

- Definition

Percentage Of Accelerated Payments Of Dealer Holdback

+ References

No definition available.

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X

- Definition

Percentage Of Advances To Dealers

+ References

No definition available.

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- Definition

Percentage Of Due From Affiliates

+ References

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- Definition

Percentage Of Payments Of Dealer Holdback

+ References

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- Definition

Percentage Of Related Party Transaction Revenues From Transaction

+ References

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- Definition

For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Publisher FASB
-Name Accounting Standards Codification
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