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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Cash Dividends
Dividends declared per common share (in dollars per share)	$ 0.1518	$ 0.1518	$ 0.1518	$ 0.1320	$ 0.1320	$ 0.1320	$ 0.4554	$ 0.3960
Payments of dividends	$ 40,700			$ 35,200			$ 121,901	$ 104,996
Share Capital
Preference shares issued (in shares)	0						0
Treasury Stock
Purchase of treasury stock (in shares)	51,794			0			726,059	0
Purchase of treasury stock	$ 2,000						$ 26,499	$ 0
Issuance of treasury stock (in shares)	61,794			20,000			609,691	407,443

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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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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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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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