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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($)	3 Months Ended				6 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Cash Dividends
Dividends declared per common share (in dollars per share)	$ 0.1518	$ 0.1518	$ 0.1320	$ 0.1320	$ 0.3036	$ 0.2640
Payments of dividends	$ 40,700,000		$ 34,800,000		$ 81,166,000	$ 69,828,000
Share Capital
Preference shares issued (in shares)	0				0
Treasury Stock
Common shares repurchased (in shares)	370,265				674,265	0
Purchase of treasury stock	$ 12,800,000		$ 0		$ 24,534,000	$ 0
Issuance of treasury stock (in shares)	544,929		379,111		547,897	387,443

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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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