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Auto Loan Receivables (Allowance For Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014 Allowance For Loan Losses [Member]		May 31, 2014 Allowance For Loan Losses [Member]		Feb. 28, 2014 Allowance For Loan Losses [Member]		Aug. 31, 2013 Allowance For Loan Losses [Member]		May 31, 2013 Allowance For Loan Losses [Member]		Feb. 28, 2013 Allowance For Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance as of beginning of period	$ 75.4	$ 60.9	$ 69.9	$ 57.3
Charge-offs	(36.9)	(31.8)	(68.9)	(58.2)
Recoveries	18.9	18.8	40.6	37.5
Provision for loan losses	(20.4)	(18.0)	(36.2)	(29.3)
Balance as of end of period	$ 77.8	$ 65.9	$ 77.8	$ 65.9
Item as percent of total ending managed receivables					0.99%	[1]	1.00%	[1]	0.97%	[1]	0.99%	[1]	0.96%	[1]	0.97%	[1]
[1] (1)Percentage of total ending managed receivables as of the corresponding reporting date.

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- Definition

Item as percent of total ending managed receivables

+ References

No definition available.

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X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9



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-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



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-Publisher FASB

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-Section 50

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