Compensation Plans - Compensation Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 74.5	$ 80.1	$ 248.4	$ 231.1
Profit sharing plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	1.5	1.2	6.9	6.4
Restricted cash awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	67.5	72.3	223.5	205.1
Restricted stock and RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 5.5	$ 6.6	$ 18.0	$ 19.6