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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Per Share | The following table presents reconciliations of the numerators of the basic and diluted per share computations:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Net income (loss) attributable to Telesat Corporation Shares |  | $ | (35,269 | ) |  | $ | 17,901 |  | $ | (29,811 | ) |  | $ | 38,591
Effect of diluted securities |  |  | — |  |  |  | 1,852 |  |  | — |  |  |  | 3,789
Diluted net income (loss) attributable to Telesat Corporation Shares |  | $ | (35,269 | ) |  | $ | 19,753 |  | $ | (29,811 | ) |  | $ | 42,380
Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share | The following table presents reconciliations of the denominators of the basic and diluted per share computations:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Basic total weighted average number of Telesat Corporation Shares outstanding |  | 14,797,243 |  | 14,046,257 |  | 14,592,627 |  | 13,888,334
Effect of diluted securities |  |  |  |  |  |  |  |
Stock options |  | — |  | 48,137 |  | — |  | 18,437
RSUs |  | — |  | 1,173,594 |  | — |  | 1,194,740
DSUs |  | — |  | 168,020 |  | — |  | 148,120
PSUs |  | — |  | 623,096 |  | — |  | 563,924
Diluted total weighted average number of Telesat Corporation Shares outstanding |  | 14,797,243 |  | 16,059,104 |  | 14,592,627 |  | 15,813,555

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