Income Taxes Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Income Tax Expense Benefit Other [Abstract]
Date on which the Tax Cuts and Jobs Act was signed into law	Dec. 22, 2017
US corporate federal tax rate before the enactment of the Tax Cuts and Jobs Act	35.00%
US corporate federal tax rate after the enactment of the Tax Cuts and Jobs Act	21.00%
Non-recurring charge to Income Taxes to reflect the estimated impact of the enactment of the Tax Cuts and Jobs Act	$ 24.7
Charge to income taxes to reflect the revaluation of the Company's deferred tax assets and liabilities to reflect the estimated impact of the enactment of the Tax Cuts and Jobs Act	21.7
Charge to income taxes to reflect the deemed repatriation of foreign-source net earnings to reflect the estimated impact of the enactment of the Tax Cuts and Jobs Act	3.0
Tax benefit related to the exercise of stock options and vesting of restricted stock	11.9
Income tax expense on net income attributable to redeemable non-controlling and other beneficial interests not taxable by the Company	$ 2.9
Reconconciliation to the Company's effective income tax rate
Federal statutory rate (as a percent)	23.30%
State and local income tax, net of federal income tax benefit	4.30%
Net income attributable to non-controlling and other beneficial interests	(1.80%)
Other	0.90%
Operating effective income tax rate	26.70%
Non-recurring impact of U.S. tax reform	18.40%
Net excess tax benefits from stock-based compensation plans	(8.80%)
Effective income tax rate (as a percent)	36.30%	37.30%