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Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended												12 Months Ended
	Oct. 18, 2021	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Number of stock retired (in share)														268,185	74,659	516,102
Number of stock retired, value														$ 15.1	$ 1.8	$ 9.5
Dividends per share (in dollars per share)		$ 0.05	$ 0.05	$ 0.05	$ 0.04	$ 0.04	$ 0.04	$ 0.04	$ 0.04	$ 0.04	$ 0.03	$ 0.04	$ 0.03	$ 0.19	$ 0.16	$ 0.14
Payments of ordinary dividends, common stock														$ 1.8	$ 1.4	$ 1.3
Stock issued during period, acquisitions (in share)	500,000

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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