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Shareholders' Equity - Additional information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	May 31, 2019
Stockholders Equity Note [Abstract]
Number of shares of common stock authorized for buyback (in shares)				10,000,000
Remaining number of shares authorized to be repurchased (in shares)	7,459,328
Treasury stock, shares, acquired (in shares)	550,853	4,866,532	3,273,040
Treasury stock, value, acquired, cost method	$ 40.8	$ 350.1	$ 249.3

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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- Definition

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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