Fair Value Measurements Transfer Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Apr. 30, 2012	Apr. 30, 2012
Consolidated Funds [Member] \| Debt Securities [Member]
Fair Value Transfer Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transfers out of Level 1 into level 2		$ 6.9
Separately Managed Accounts [Member] \| Equity Securities [Member]
Fair Value Transfer Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transfers out of Level 1 into level 2		0.3
Transfers out of Level 2 into level 1	$ 2.6

The amount of the transfers of assets or liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

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

Name:	us-gaap_FairValueLevel1ToLevel2TransfersAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration