| 2026-01-22 | 10-K | Stock registered under Section 12(b) | Common Shares · NG · NYSE |
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| 2025-10-01 | 10-Q | Stock registered under Section 12(b) | Common Shares, no par value · NG · NYSEAMER |
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| 2025-03-10 | 10-K/A | Stock registered under Section 12(b) | Common Shares · NG · NYSE |
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| 2025-03-10 | 10-K/A | Well-known seasoned issuer | Yes |
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| 2025-01-23 | 10-K | Stock registered under Section 12(b) | Common Shares · NG · NYSE |
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| 2025-01-23 | 10-K | Well-known seasoned issuer | Yes |
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| 2024-01-24 | 10-K | Stock registered under Section 12(b) | Common Shares · NG · NYSE |
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| 2024-01-24 | 10-K | Well-known seasoned issuer | Yes |
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| 2023-01-25 | 10-K | Stock registered under Section 12(b) | Common Shares · NG · NYSE |
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| 2023-01-25 | 10-K | Well-known seasoned issuer | Yes |
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| 2022-06-29 | 10-Q | Stock registered under Section 12(b) | Common Shares, no par value · NG · NYSEAMER |
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| 2022-01-26 | 10-K | Stock registered under Section 12(b) | Common Shares · NG · NYSE |
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| 2022-01-26 | 10-K | Well-known seasoned issuer | Yes |
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| 2021-03-31 | 10-Q | Stock registered under Section 12(b) | Common Shares, no par value · NG · NYSEAMER |
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| 2021-01-27 | 10-K | Stock registered under Section 12(b) | Common Shares · NG · NYSEAMER |
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| 2021-01-27 | 10-K | Well-known seasoned issuer | Yes |
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| 2020-09-30 | 10-Q | Stock registered under Section 12(b) | Common Shares, no par value · NG · NYSEAMER |
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| 2020-06-24 | 10-Q | Stock registered under Section 12(b) | Common Shares, no par value · NG · NYSEAMER |
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| 2020-04-01 | 10-Q | Stock registered under Section 12(b) | Common Shares, no par value · NG · NYSEAMER |
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| 2020-01-22 | 10-K | Stock registered under Section 12(b) | Common Shares · NG · NYSEAMER |
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| 2020-01-22 | 10-K | Well-known seasoned issuer | Yes |
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| 2019-10-01 | 10-Q | Stock registered under Section 12(b) | Common Shares, no par value · NG · NYSEAMER |
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| 2019-01-23 | 10-K | Well-known seasoned issuer | Yes |
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| 2018-06-27 | 10-Q | Well-known seasoned issuer | Yes |
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| 2018-04-04 | 10-Q | Well-known seasoned issuer | Yes |
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| 2018-01-24 | 10-K | Well-known seasoned issuer | Yes |
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| 2017-10-03 | 10-Q | Well-known seasoned issuer | Yes |
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| 2017-06-27 | 10-Q | Well-known seasoned issuer | Yes |
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| 2017-04-03 | 10-Q | Well-known seasoned issuer | Yes |
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| 2017-01-25 | 10-K | Well-known seasoned issuer | Yes |
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| 2016-01-27 | 10-K | Well-known seasoned issuer | Yes |
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