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Auto Loan Receivables (Past Due Receivables) (Details) - USD ($) $ in Millions	May 31, 2018	Feb. 28, 2018
Financing Receivable, Past Due [Line Items]
Total ending managed receivables	$ 11,925.0	$ 11,618.9
Total past due	$ 376.3	$ 393.2
Past due receivables as a percentage of total ending managed receivables	3.20%	3.40%
Total ending managed receivables, percent
Financing Receivable, Past Due [Line Items]
Item as percent of total ending managed receivables	100.00%	100.00%
Thirty One To Sixty Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total past due	$ 239.1	$ 246.6
Past due receivables as a percentage of total ending managed receivables	2.00%	2.10%
Sixty One To Ninety Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total past due	$ 110.1	$ 116.9
Past due receivables as a percentage of total ending managed receivables	0.90%	1.00%
Greater Than Ninety Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total past due	$ 27.1	$ 29.7
Past due receivables as a percentage of total ending managed receivables	0.30%	0.30%

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- Definition

Past due receivables as a percentage of total ending managed receivables.

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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