Stock and Stock-Based Incentive Plans Stock and Stock-Based Incentive Plans (Narrative) (Details) - Share Repurchase Program - USD ($) $ in Millions	Aug. 31, 2019	Aug. 31, 2018
Stock and Stock-Based Incentive Plans
Stock Repurchase Program, Authorized Amount	$ 2,000.0
Available for repurchase, as of end of period	$ 1,780.8	$ 638.3

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