Acquisitions 1 (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Oct. 31, 2016
Atlanta Capital [Member]
Business Acquisition Contingent Consideration [Line Items]
Company's increase in profit interest percentage under acquisition agreement, during the period	0.02%
Non-controlling interest holders total (direct and indirect) profits interest, end of period	13.20%		13.00%
Profit interest granted to non-controlling interest holders under the Long-term Equity Incentive Plan	1.10%
Company's increase in indirect profit interest percentage under Long-term Equity Incentive Plan, during the period	0.90%
Purchase of non-controlling interests	$ 0.1
Amount paid for indirect profit interest pursuant to the put and call provisions of the Long-term Equity Incentive Plan	$ 1.9
Parametric Portfolio Associates [Member]
Business Acquisition Contingent Consideration [Line Items]
Company's increase in capital interest percentage under acquisition agreement, during the period	0.50%	0.50%
Company's increase in profit interest percentage under acquisition agreement, during the period	0.50%	0.50%
Non-controlling interest holders capital ownership percentage, end of period	1.30%		1.80%
Non-controlling interest holders total (direct and indirect) profits interest, end of period	6.40%		7.00%
Company's increase in indirect profit interest percentage under Long-term Equity Incentive Plan, during the period	0.10%
Amount paid for indirect profit interest pursuant to the put and call provisions of the Long-term Equity Incentive Plan	$ 0.6
Parametric Portfolio Associates [Member] | Call Option [Member]
Business Acquisition Contingent Consideration [Line Items]
Purchase of non-controlling interests	$ 6.9	$ 2.1
Parametric Portfolio Associates [Member] | Put Option [Member]
Business Acquisition Contingent Consideration [Line Items]
Purchase of non-controlling interests		$ 4.1
Tax Advantaged Bond Strategies [Member]
Business Acquisition Contingent Consideration [Line Items]
Future contingent payments	11.6