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CAPITAL STOCK - Schedule of Common Shares Purchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Aggregate cost (including transaction fees) of common shares repurchased for cancellation | $ 75.0 | $ 16.5
Number of common shares repurchased for cancellation (in shares) | 0.6 | 0.5
Weighted average price per share for repurchases (in dollars per share) | $ 114.46 | $ 35.96
Aggregate cost (including transaction fees) of Common Shares repurchased for delivery under SBC plans | $ 221.6 | $ 101.6
Treasury stock, shares, acquired for share-based compensation plans (in shares) | 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) |  | 0.5

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