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Shareholders' Equity - Summary of Repurchases of Common Stock (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Sep. 30, 2021	Sep. 30, 2020
Class of Stock Disclosures [Abstract]
Shares of Common Stock repurchased	1,362,831	1,508,467	927,934	550,853
Cost of shares of Common Stock repurchased	$ 150.0	$ 155.0	$ 107.8	$ 40.8

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

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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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