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Share Capital - Narrative (Details) $ / shares in Units, $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |
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May 11, 2020 shares | Sep. 21, 2020 USD ($) shares | Jun. 30, 2020 CAD ($) acqusition $ / shares shares | Jun. 30, 2020 USD ($) acqusition $ / shares | Jun. 30, 2019 acqusition shares | May 10, 2020 shares | Apr. 16, 2020 USD ($) | Apr. 15, 2020 USD ($) | Apr. 02, 2019 USD ($)
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 110,089,377 | 5,278,286 | 21,009,339 |  |  | 1,321,072,394 |  |  |
Shelf prospectus, amount allowed | $ |  |  |  |  |  |  | $ 100,000,000.0 |  | $ 750,000,000.0
ATM supplement, amount allowed, common shares | $ |  |  |  |  |  |  | 650,000,000.0 | $ 400,000,000.0 | $ 400,000,000.0
ATM supplement, additional amount allowed, common shares | $ |  |  |  |  |  |  | $ 250,000,000 |  |
Number of shares outstanding (in shares) | 110,089,377 |  |  |  |  | 1,321,072,394 |  |  |
Stock split ratio | 0.0833 |  |  |  |  |  |  |  |
Number of shares issued and fully paid (in shares) |  |  | 115,228,811 |  | 84,786,562 |  |  |  |
ATM supplement, gross proceeds |  | $ 36,670,000 | $ 585.1 | $ 435,500,000 |  |  |  |  |
Proceeds received per share (in CAD per share) | (per share) |  |  | $ 27.85 | $ 20.73 |  |  |  |  |
Brokerage fee expense |  |  | $ 11.7 | $ 8,700,000 |  |  |  |  |
ATM supplement, net proceeds |  |  | $ 573.4 | $ 426,800,000 |  |  |  |  |
Number of common shares per warrant (in shares) |  |  | 1 |  |  |  |  |  |
Class A Preference Shares |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Par value per share (in CAD per share) | $ / shares |  |  | $ 1.00 |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 0 |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  | 0 |  |  |  |  |  |
Class B Preference Shares |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Par value per share (in CAD per share) | $ / shares |  |  | $ 5.00 |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 0 |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  | 0 |  |  |  |  |  |
Compensation Options |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Number of common shares per option (in shares) |  |  | 1 |  |  |  |  |  |
Number of warrants per option (in shares) |  |  | 0.5 |  |  |  |  |  |
Compensation Warrants |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Number of common shares per warrant (in shares) |  |  | 1 |  |  |  |  |  |
Exercise period of options |  |  | 2 years | 2 years |  |  |  |  |
Milestone Payments Contingent Liabilities |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 614,513 |  | 20,311 |  |  |  |
Number of acquisitions | acqusition |  |  | 3 | 3 | 2 |  |  |  |

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