Accounting Developments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Feb. 28, 2015	Feb. 28, 2014	May. 31, 2014	Nov. 30, 2014	Nov. 30, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Decrease in Level 3 assets	$ 72.6	$ 95.6	$ 94.9	$ 97.1	$ 91.6

Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration