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Shareholders' capital - Common Shares (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Common Shares Rollforward |  |
Beginning balance (in shares) | 431,765,935 | 274,087,018
Public offering and subscription receipts (in shares) | 50,041,624 | 43,470,000
Conversion of convertible debentures (in shares) | 56,926 | 108,370,081
Dividend reinvestment plan (in shares) | 5,880,843 | 3,905,848
Exercise of share-based awards | 1,106,105 | 1,932,988
Ending balance (in shares) | 488,851,433 | 431,765,935

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- Definition Stock Issued During Period, Shares, Dividend reinvestment and Employee Stock Purchase Plan + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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