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CAPITAL STOCK - Schedule of Common Shares Purchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Aggregate cost (including transaction fees) of common shares repurchased for cancellation | $ 40.0 | $ 10.0 | $ 115.0 | $ 26.5
Number of common shares repurchased for cancellation (in shares) | 0.6 | 0.2 | 1.2 | 0.7
Weighted average price per share for repurchases (in dollars per share) | $ 70.48 | $ 46.74 | $ 94.05 | $ 39.39
Aggregate cost (including transaction fees) of Common Shares repurchased for delivery under SBC plans | $ 0.0 | $ 0.0 | $ 221.6 | $ 101.6
Treasury stock, shares, acquired for share-based compensation plans (in shares) | 0.0 | 0.0 | 1.7 | 2.8
NCIB ASPP |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Number of common shares repurchased for cancellation (in shares) | 0.6 | 0.0 | 0.6 | 0.5

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