Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Aug. 31, 2018	Nov. 30, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 131.5			$ 131.5	$ 129.5
Unrecognized tax benefits that would impact effective tax rate in future	104.1			104.1	86.1
Accrued interest on unrecognized tax benefits	52.5			52.5	$ 48.3
Provisional estimate of impact of the Tax Act			$ 163.7	160.2
Decrease of provisional estimate of impact of the Tax Act	$ 0.3	$ 3.2
Provisional estimate of impact of the Tax Act related to revaluation of deferred tax asset				108.5
Provisional estimate of impact of the Tax Act related to deemed repatriation of foreign earnings				$ 51.7