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v3.19.3.a.u2

Shareholders' capital - Common Shares (Detail) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Common Shares Rollforward |  |
Beginning balance (in shares) | 488,851,433 | 431,765,935
Public offering and subscription receipts (in shares) | 28,009,341 | 50,041,624
Dividend reinvestment plan (in shares) | 6,068,465 | 5,880,843
Exercise of share-based awards | 1,274,655 | 1,106,105
Conversion of convertible debentures (in shares) | 19,429 | 56,926
Ending balance (in shares) | 524,223,323 | 488,851,433

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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