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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions				12 Months Ended		15 Months Ended
	Feb. 24, 2020	Nov. 18, 2019	Jul. 24, 2018	Sep. 30, 2020	Sep. 30, 2019	Feb. 24, 2020
Accelerated Share Repurchases [Line Items]
Authorized share repurchase amount			$ 1,000,000,000.0
Share repurchase program, authorization period			36 months
Number of shares repurchased (in shares)				6.2	4.9
Total repurchase amount					$ 268,500,000
Average price per share (in dollars per share)				$ 58.57	$ 54.34
ASR
Accelerated Share Repurchases [Line Items]
Accelerated share repurchase amount		$ 125,000,000.0
Number of shares repurchased (in shares)	0.3	1.7		2.0		2.0
Percentage of company total shares		85.00%
Total repurchase amount	$ 18,500,000	$ 106,300,000		$ 125,000,000.0
Adjustment to additional paid-in capital		$ 18,700,000
Average price per share (in dollars per share)				$ 61.47		$ 61.59

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