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Share Capital, Option Plans and Share-Based Payments (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | 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 | $ 0.4000 | $ 0.3450 |  |
Payments of dividends to shareholders | $ 24,200,000 | $ 21,100,000 | $ 47,528,000 | $ 42,100,000 |  |
Preference shares issued (in shares) | 0 |  | 0 |  |  |
Stock repurchased during period, shares (in shares) | 225,000 | 0 | 225,000 | 0 |  |
Stock repurchased during the period | $ 10,600,000 |  | $ 10,600,000 |  |  |
Amount authorized to be repurchased |  |  |  |  | $ 200,000,000 |
Common shares repurchased and cancelled during period, shares (in shares) | 300,000 |  | 1,500,000 |  |  |
Common shares repurchased and cancelled during period, value | $ 15,500,000 | $ 0 | $ 65,500,000 | $ 0 |  |
Remaining number of shares authorized to be repurchased | $ 134,500,000 |  | $ 134,500,000 |  |  |
Options outstanding (in shares) | 4,257,350 |  | 4,257,350 |  |  | 4,375,365
Unrecognized compensation cost relating to unvested stock awards | $ 29,400,000 |  | $ 29,400,000 |  |  |
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 | 1,300,000 | $ 6,300,000 | 7,600,000 |  |
Tax benefit realized from exercise of options | $ 0 | $ 300,000 | $ 200,000 | $ 800,000 |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |
Options outstanding (in shares) | 4,257,350 |  | 4,257,350 |  |  |
Common shares available for issuance (in shares) | 2,904,833 |  | 2,904,833 |  |  |
Award vesting period |  |  | 4 years |  |  |
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) | 5,000 |  | 5,000 |  |  |
Award vesting period |  |  | 3 years |  |  |
Stock issued during period, treasury stock reissued | $ 100,000 |  | $ 100,000 |  |  |
RSUs granted in accordance with employment agreements (in shares) | 0 | 2,500 | 0 | 15,000 |  |
Deferred Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |
RSUs granted in accordance with employment agreements (in shares) | 52,817 | 0 | 53,373 | 398 |  |
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) | 207,078 | 355,553 | 207,078 | 355,553 |  |
Unvested stock awards compensation cost, weighted average recognition period |  |  | 2 years 1 month 4 days |  |  |
Compensation cost related to unvested awards not yet recognized | $ 17,600,000 |  | $ 17,600,000 |  |  |
Employee Share Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash received from employee stock purchase plan | 700,000 | $ 700,000 | $ 1,700,000 | $ 1,500,000 |  |
Minimum | Employee Share Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards purchase price discount |  |  | 5.00% |  |  |
Maximum | Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |
Maximum | Employee Share Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards purchase price discount |  |  | 15.00% |  |  |
Retained Earnings |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares repurchased and cancelled during period, value | $ 13,200,000 |  | $ 55,700,000 |  |  |

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