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Equity Items - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended							9 Months Ended		12 Months Ended
	Aug. 31, 2019	May 31, 2019	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Accelerated Share Repurchases [Line Items]
Common shares repurchased			0				2,236,546			0	2,236,546
Common Stock, Dividends, Per Share, Paid			$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.25	$ 0.25	$ 0.825
Percentage of increase in cash dividend										10.00%
2019 Accelerated Share Repurchase Agreement [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchase During Period Value		$ 200
Stock Repurchased And Retired During Period Shares		2,200,000										2,600,000
Common shares repurchased	400,000									0

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Percentage of increase in cash dividend.

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

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