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Shareholders' Equity - Summary of Activity of Common Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			12 Months Ended		15 Months Ended
	Feb. 24, 2020	Nov. 18, 2019	Sep. 30, 2020	Sep. 30, 2019	Feb. 24, 2020
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)			6.2	4.9
Average price per share (in dollars per share)			$ 58.57	$ 54.34
Total repurchase amount				$ 268.5
Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 364.6	$ 268.5
Open Market Purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)			4.1	4.6
Average price per share (in dollars per share)			$ 56.97	$ 54.22
Total repurchase amount				$ 250.0
Open Market Purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 230.6
Private Purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)			0.1	0.3
Average price per share (in dollars per share)			$ 62.30	$ 56.02
Total repurchase amount				$ 18.5
Private Purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 9.2
ASR
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)	0.3	1.7	2.0		2.0
Average price per share (in dollars per share)			$ 61.47		$ 61.59
Total repurchase amount	$ 18.5	$ 106.3	$ 125.0
ASR | Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 124.8

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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