Non-Traded Investments (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010
Non-Traded Investments (Textual) [Abstract]
Carrying amount of the investments, included in other assets	$ 219.3	$ 128.1
Liability for estimated future capital contributions to the investments	$ 173.3	$ 74.7

The carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5728-111685

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant