Automobile Loan Receivables - Reconciliation of Automobile Loan Receivables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2011 months	Jun. 30, 2010	Jun. 30, 2011 years months	Jun. 30, 2010	Dec. 31, 2010
Loans Receivable, Net [Abstract]
Maximum Original Term Sales Contracts and Loans Months	72		72
Maximum Remaining Term Sales Contracts and Loans Months	47		47
Sales Contracts Originated			0		0
Loans and Leases Receivable, Net Reported Amount [Abstract]
Sales Contracts and Loans Receivable	$ 255.7		$ 255.7		$ 382.9
Unearned Discounts and Deferred Fees	(0.8)		(0.8)		(1.6)
Net Automobile Loan Receivables Outstanding	254.9		254.9		381.3
Reserve for Loan Losses	(22.3)	(74.8)	(22.3)	(74.8)	(43.7)
Automobile Loan Receivables	232.6		232.6		337.6
Allowance for Loan and Lease Losses [Roll Forward]
Reserve for Loan Losses - Beginning of Period	32.1	74.7	43.7	83.3	83.3
Provision for Loan Losses	(14.4)	0	(28.2)	2.9
Net Recovery (Charge-off):
Automobile Loan Receivables Charged Off	(4.7)	(9.1)	(14.5)	(31.5)
Automobile Loan Receivables Recovered	9.3	9.2	21.3	20.1
Net Recovery (Charge-off)	4.6	0.1	6.8	(11.4)
Reserve for Loan Losses - End of Period	$ 22.3	$ 74.8	$ 22.3	$ 74.8	$ 43.7

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Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses.

+ References

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- Definition

Reflects a reduction in bad debt expense attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

+ References

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- Definition

The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

+ References

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- Definition

Reflects the cumulative amount of interest and fees paid by borrowers which have not yet been taken into income in conformity with GAAP. Also reflects the amount of unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans that are being amortized into income as an adjustment to yield.

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Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

+ References

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-Publisher AICPA
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Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Audit and Accounting Guide (AAG)
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-Publisher OTS
-Name Federal Regulation (FR)
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-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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- Definition

Total of loans held-for-sale and held-in-portfolio net of unearned income, allowance for loan and lease losses, if any, unamortized loan origination and other fees and costs, and purchased premiums or discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 9
-Section 03
-Paragraph 7
-Subparagraph a

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Reflects the net amount of other additions and reductions in the reserve for credit losses and recoveries of bad debts.

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- Definition

The maximum original term for sales contracts and loans, in months.

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The maximum remaining term for sales contracts and loans, in months.

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- Definition

Sales Contracts Originated

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