Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2013
Clifton Group [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Business acquisition cost of acquired entity cash paid	$ 67.2
Business acquisition cost of acquired entity other noncash consideration	12.8
Business acquisition purchase price allocation amortizable intangible assets	24.5
Business acquisition purchase price allocation goodwill amount	58.9
Finite-Lived Intangible Assets, Weighted-Average Useful Life	18 years
Parametric Portfolio Associates [Member]
Business Acquisition Contingent Consideration [Line Items]
Minority interest ownership percentage purchased by parent	3.40%
Company's increase in profit interest percentage, during the period	5.70%
Non-controlling interest holders profits interest, end of period	4.90%
Profits interest granted to non-controlling interest holders	0.76%
Company's profit interest percentage, end of period	93.30%
Purchase of non-controlling interests	43.5
Company's capital ownership interest at the end of the period	98.10%
Noncontrolling capital and profits interest issued in acquisition	1.90%
Tax Advantaged Bond Strategies [Member]
Business Acquisition Contingent Consideration [Line Items]
Contingent payment made during the period	14.1
Goodwill acquired	$ 14.1