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Changes in Stockholders' Equity (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended
	Nov. 30, 2021	Sep. 30, 2021	Aug. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, outstanding balance authorized to be repurchased		$ 170.0
Accelerated share repurchases, settlement (payment) or receipt			$ 75.0
Stock repurchased and retired during period (in shares)		558,471
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated share repurchases, settlement (payment) or receipt	$ 60.0
Stock repurchased and retired during period (in shares)	393,733

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- Definition

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

+ References

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
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Amount remaining of a stock repurchase plan authorized.

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-SubTopic 10
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