Earnings Per Share and Stock Issuances - Common Stock Activity (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Stock Options And Restricted Stock Units
Employee Stock Purchase Plan [Line Items]
Shares issued, net of shares withheld for taxes, under stock options, RSUs, LTPP and employee stock purchase plans	0.5	0.0	1.0	0.6
Share Repurchase Program
Employee Stock Purchase Plan [Line Items]
Shares repurchased under the stock repurchase program	0.1	0.0	0.4	1.4