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Unrecognized cost of unvested share-based compensation awards.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual 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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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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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Share Capital, Option Plans and Share-Based Payments (Narrative) (Details) - USD ($)			3 Months Ended			9 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Jul. 28, 2015	Jun. 30, 2015
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Dividends declared per common share (in dollars per share)			$ 0.2000		$ 0.1725	$ 0.6000	$ 0.5175
Payments of dividends to shareholders			$ 24,100,000		$ 21,100,000	$ 71,627,000	$ 63,174,000
Preference shares issued (in shares)	0		0			0
Stock repurchased during the period					$ 1,300,000	$ 10,600,000	$ 1,300,000
Common shares repurchased (in shares)			0		22,222	225,000	22,222
Amount authorized to be repurchased								$ 200,000,000
Common shares repurchased and cancelled during period, value			$ 0		$ 0	$ 65,500,000	$ 0
Common shares repurchased and cancelled during period, shares (in shares)						1,476,248
Remaining number of shares authorized to be repurchased	$ 134,500,000		$ 134,500,000			$ 134,500,000
Options outstanding (in shares)	4,214,440		4,214,440			4,214,440			4,375,365
Unrecognized compensation cost relating to unvested stock awards	$ 27,100,000		$ 27,100,000			$ 27,100,000
Unvested stock awards compensation cost, weighted average recognition period						2 years 3 months 19 days
Cash proceeds from exercise of options granted			2,000,000		3,100,000	$ 8,300,000	10,700,000
Tax benefit realized from exercise of options			$ 400,000		$ 100,000	$ 600,000	$ 900,000
Stock Options
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Options outstanding (in shares)	4,214,440		4,214,440			4,214,440
Common shares available for issuance (in shares)	2,856,391		2,856,391			2,856,391
Expire period of options, minimum term						7 years
Expire period of options, maximum term						10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Stock issued during period, shares, treasury stock reissued (in shares)			10,000		22,222	15,000	22,222
Award vesting period						3 years
Stock issued during period, treasury stock reissued			$ 200,000		$ 1,300,000	$ 300,000	$ 1,300,000
Units granted (in shares)			25,000		30,000	25,000	45,000
Deferred Stock Units
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Units granted (in shares)			1,287		37,199	54,660	37,597
2015 Long Term Incentive Plan
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Stock issued during period, shares, treasury stock reissued (in shares)				202,078
Stock issued during period, treasury stock reissued				$ 5,000,000
Long Term Incentive Plan
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Stock issued during period, shares, treasury stock reissued (in shares)			10,000		22,222	217,078	377,775
Unvested stock awards compensation cost, weighted average recognition period						1 year 11 months
Compensation cost related to unvested awards not yet recognized	$ 15,200,000		$ 15,200,000			$ 15,200,000
Employee Share Purchase Plan
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Awards purchase price discount	15.00%	5.00%
Common Stock, Capital Shares Reserved for Future Issuance	40,900		40,900			40,900
Cash received from employee stock purchase plan			$ 1,800,000		$ 700,000	$ 3,500,000	$ 2,200,000
Minimum \| Stock Options
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Award vesting period						4 years
Maximum \| Stock Options
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Award vesting period						5 years
Retained Earnings
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Common shares repurchased and cancelled during period, value						$ 55,700,000