Selected Quarterly Data (Scheduled Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Aug. 31, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Class of Stock [Line Items]
After tax impact transaction and integration expenses	$ 0.3	$ 4.3	$ 6.1	$ 6.9	$ 22.4	$ 31.1
EPS Impact of Transaction and Integration Expenses - Basic			$ 0.05			$ 0.25
EPS Impact of Transaction and Integration Expenses - Diluted		$ 0.04	$ 0.04	$ 0.05	$ 0.17	$ 0.24
Noncash income tax benefit (related to enactment of the U.S. Tax Act)	$ (6.7)	$ 10.3		$ 297.9						$ (309.4)	$ 0.0	$ 0.0
EPS Impact of U.S. Tax Act, Provisional Income Tax Expense (Benefit) - Basic				$ 2.27
EPS Impact of U.S. Tax Act, Provisional Income Tax Expense (Benefit) - Diluted	$ (0.05)	$ (0.08)		$ (2.24)
Revenues	$ 1,499.2	$ 1,345.3	$ 1,327.3	$ 1,237.1	$ 1,490.9	$ 1,185.2	$ 1,114.3	$ 1,043.7		5,408.9	4,834.1	4,411.5
Gross profit	681.5	594.9	575.2	520.0	668.2	484.4	444.6	413.0		2,371.6	2,010.2	1,831.7
Operating income	294.9	233.0	191.7	183.7	266.9	168.7	132.6	134.2		903.3	702.4	641.0
Net income	$ 214.0	$ 173.5	$ 123.3	$ 422.6	$ 175.7	$ 108.2	$ 100.0	$ 93.5		$ 933.4	$ 477.4	$ 472.3
Basic earnings per share	$ 1.62	$ 1.32	$ 0.94	$ 3.22	$ 1.34	$ 0.86	$ 0.80	$ 0.75		$ 7.10	$ 3.77	$ 3.73
Diluted earnings per share	1.60	1.30	0.93	3.18	1.32	0.85	0.79	0.74		7.00	3.72	3.69
Dividends paid per share (usd per share)	0.52	0.52	0.52	0.52	0.47	0.47	0.47	0.47		2.08	1.88	1.72
Common Stock, Dividends, Per Share, Declared	$ 1.09	$ 0.52	$ 0.52	$ 0.00	$ 0.99	$ 0.47	$ 0.47	$ 0.00		$ 2.13	$ 1.93	$ 1.76
Special charges	$ 2.4	$ 3.3	$ 8.4	$ 2.2	$ 9.2		$ 4.7	$ 3.6	$ 4.7	$ 16.3	$ 22.2	$ 15.7
After tax impact of special charges	$ 1.9	$ 2.5	$ 6.5	$ 1.6	$ 6.7		$ 3.4	$ 2.5	$ 3.2
EPS impact of Special charges - Diluted	$ 0.02	$ 0.02	$ 0.05	$ 0.01	$ 0.05		$ 0.03	$ 0.02	$ 0.03
Transaction and integration expenses	$ 0.4	$ 5.6	$ 7.8	$ 8.7	$ 31.3				$ 30.4	$ 22.5
Transaction expenses included in cost of goods sold					$ 15.0				5.9
Transaction expenses included in other debt costs									$ 15.4