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Stockholders' Equity (Share Repurchases) (Details) - USD ($)	1 Months Ended
	Oct. 14, 2019	Sep. 30, 2019	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share repurchase program, amount authorized			$ 350,000,000	$ 450,000,000	$ 400,000,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share repurchase program, amount authorized		$ 600,000,000
Number of shares repurchased	874,475
Value of shares repurchased	$ 30,800,000

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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