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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 |  |  |

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