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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Cash Dividends
Dividends declared per common share (in dollars per share)	$ 0.1746	$ 0.1518	$ 0.5238	$ 0.4554
Payments of dividends	$ 47,300,000	$ 40,700,000	$ 141,377,000	$ 121,901,000
Share Capital
Preference shares issued (in shares)	0		0
Treasury Stock
Purchase of treasury stock (in shares)	0	51,794	300,000	726,059
Payments for Repurchase of Common Stock	$ 0	$ 2,000,000.0	$ 12,424,000	$ 26,499,000
Issuance of treasury stock (in shares)	0	61,794	255,502	609,691

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

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The cash outflow to reacquire common stock during the period.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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