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Stock-Based Compensation Plans (Summary of restricted share activity) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Nov. 23, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Special dividends payable amount per share				$ 4.25
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, beginning of period shares	5,377,000
Granted, shares	1,694,000
Vested, shares	(6,957,000)
Forfeited, shares	(114,000)
Unvested, end of period shares	0	5,377,000
Unvested, weighted-average grant date fair value, beginning of period ($ per share)	$ 42.72
Granted, weighted-average grant date fair value ($ per share)	46.36
Vested, weighted-average grant date fair value ($ per share)	43.57
Forfeited, weighted-average grant date fair value ($ per share)	44.59
Unvested, weighted-average grant date fair value, end of period ($ per share)	$ 0	$ 42.72
Fair value of restricted stock that vested during the period	$ 303.1	$ 52.7	$ 47.2
Deferred Stock Units [Member] \| Atlanta Capital Phantom Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, beginning of period shares	37,470,000
Granted, shares	23,938,000
Vested, shares	(4,941,000)
Unvested, end of period shares	56,467,000	37,470,000
Unvested, weighted-average grant date fair value, beginning of period ($ per share)	$ 137.52
Granted, weighted-average grant date fair value ($ per share)	150.42
Vested, weighted-average grant date fair value ($ per share)	138.68
Unvested, weighted-average grant date fair value, end of period ($ per share)	$ 142.89	$ 137.52
Phantom Incentive Units [Member] \| Parametric Phantom Incentive Plan 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, beginning of period shares	75,000
Vested, shares	(15,000)
Forfeited, shares	(5,000)
Unvested, end of period shares	55,000	75,000
Unvested, weighted-average grant date fair value, beginning of period ($ per share)	$ 2,091.93
Vested, weighted-average grant date fair value ($ per share)	2,062.75
Forfeited, weighted-average grant date fair value ($ per share)	2,208.66
Unvested, weighted-average grant date fair value, end of period ($ per share)	$ 2,089.28	$ 2,091.93
Phantom Incentive Units [Member] \| Parametric Phantom Incentive Plan 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, beginning of period shares	5,897,000
Vested, shares	(591,000)
Forfeited, shares	(638,000)
Unvested, end of period shares	4,668,000	5,897,000
Unvested, weighted-average grant date fair value, beginning of period ($ per share)	$ 22.82
Vested, weighted-average grant date fair value ($ per share)	22.81
Forfeited, weighted-average grant date fair value ($ per share)	22.80
Unvested, weighted-average grant date fair value, end of period ($ per share)	$ 22.82	$ 22.82