Fair Value of Financial Instruments (Details 2) (AFS Debt Securities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
May 31, 2012	May 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Balance as of March 1	$ 28.5	$ 40.8
Total net gains
Included in earnings (interest expense, net)	1.2	1.5
Total net (losses) gains	(1.1)	3.1
Balance as of the end of the period	27.4	43.9
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Total net gains
Included in other comprehensive income	(2.3)
Accumulated Translation Adjustment [Member]
Total net gains
Included in other comprehensive income		$ 1.6

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity).

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration