Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Nov. 30, 2018	Nov. 30, 2017
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%			35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 376.5
U.S. Tax Act, Incomplete Accounting, Transition Tax		72.3
U.S. Tax Act, Non-cash Income Tax Expense (Benefit)	$ 0.0	297.9	$ 301.5
U.S. Tax Act, Incomplete Accounting, Withholding Tax on Repatriation Earnings		6.3
Effective income tax rate reconciliation, tax credit, amount	17.6	303.0
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations		2.2
Domestic Tax Authority
Income Tax Examination [Line Items]
Shares issued, tax benefit	1.6	3.4
Foreign Tax Authority
Income Tax Examination [Line Items]
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount		$ 0.5
Accounting Standards Update 2016-16 [Member]
Income Tax Examination [Line Items]
Effective income tax rate reconciliation, tax credit, amount	$ (16.2)