Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Nov. 30, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustment		$ (197.3)	$ (114.5)	$ (197.3)	$ (114.5)	$ (124.4)
Unrealized loss on foreign currency exchange contracts		(1.5)	(4.1)	(1.5)	(4.1)	(3.6)
Unamortized value of settled interest rate swaps		0.8	1.0	0.8	1.0	0.8
Pension and other postretirement costs		(156.1)	(148.3)	(156.1)	(148.3)	(152.3)
Accumulated other comprehensive loss		(354.1)	(265.9)	(354.1)	(265.9)	$ (279.5)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				20.9
Reclassification adjustment from AOCI on derivatives, before tax		0.6	(0.2)	3.1	(1.9)
Reclassification adjustment from AOCI on derivatives, tax		(0.1)	0.1	(0.6)	0.6
Reclassification adjustment from AOCI on derivatives, net of tax		0.5	(0.1)	2.5	(1.3)
Amortization adjustment from AOCI, pension and other postretirement benefit plans, for net prior service cost (credit), before tax	[1]	(2.2)	(0.3)	(6.0)	0.3
Reclassification adjustment from AOCI, pension and other postretirement benefit plans, for net gain (loss), before tax	[1]	3.1	2.3	9.5	7.4
Reclassification adjustment from AOCI, pension and other postretirement benefit plans, before tax		0.9	2.0	3.5	7.7
Reclassification adjustment from AOCI, pension and other postretirement benefit plans, for net (gain) loss, tax		(0.2)	(0.7)	(0.8)	(2.7)
Reclassification adjustment from AOCI, pension and other postretirement benefit plans, for net (gain) loss, net of tax		0.7	1.3	2.7	5.0
Interest rate contracts | Cash Flow Hedging | Interest Expense
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification adjustment from AOCI on derivatives, before tax		(0.2)	0.1	(0.4)	0.2
Foreign exchange contracts | Cash Flow Hedging | Cost of Sales
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification adjustment from AOCI on derivatives, before tax		$ 0.8	$ (0.3)	$ 3.5	$ (2.1)

[1] This accumulated other comprehensive income (loss) component is included in the computation of total pension expense and other postretirement benefits expense (refer to note 7 for additional details).