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CAPITAL STOCK (Tables)
 9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Stockholders Equity
Activities with respect to our capital stock for the periods indicated are set forth below:
Number of shares (in millions)Common Shares
Issued and outstanding at December 31, 2023
119.0 
Issued from treasury (1)
0.3 
Cancelled under normal course issuer bids (NCIB)
(2.9)
Issued and outstanding at September 30, 2024
116.4 
Issued and outstanding at December 31, 2024
116.1 
Issued from treasury (1)
0.1 
Cancelled under NCIB(1.2)
Issued and outstanding at September 30, 2025
115.0 
(1)    From time to time, we issue shares from treasury to settle our vested stock options, restricted share units (RSUs) and performance share units (PSUs). In Q3 2025, nil were issued from treasury upon the exercise of stock options (Q3 2024 — nil); in YTD 2025, 0.03 million were issued from treasury upon the exercise of stock options for aggregate cash proceeds of $0.3 (YTD 2024 — 0.3 million shares were issued from treasury upon the exercise of stock options by our Chief Executive Officer for aggregate cash proceeds of $3.9).
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award
Information regarding Common Shares purchases in Q3 2025 and YTD 2025 and respective prior year periods, for cancellation and for SBC plan delivery obligations (including under ASPPs) is set forth below:
Three months ended September 30Nine months ended September 30
2025202420252024
Aggregate cost (including transaction fees and excluding share buyback taxes) of Common Shares repurchased for cancellation$— $100.0 $115.0 $126.5 
Number of Common Shares repurchased for cancellation (in millions)(1)
— 2.2 1.2 2.9 
Weighted average price per share for repurchases$— $44.44 $94.05 $43.28 
Aggregate cost (including transaction fees) of Common Shares repurchased for delivery under SBC plans$— $— $221.6 $101.6 
Number of Common Shares repurchased for delivery under SBC plans (in millions)(2)
— — 1.7 2.8 
(1)    For Q3 2025 and YTD 2025, includes nil and 0.6 million Common Shares, respectively, purchased for cancellation under NCIB ASPPs (Q3 2024 — nil; YTD 2024 — 0.5 million).
(2)    Consists entirely of SBC ASPP purchases through an independent broker.
Information regarding RSU, PSU and DSU grants to employees and directors, as applicable, for the periods indicated is set forth below (no stock options were granted in the periods below):
Three months ended September 30Nine months ended September 30
 2025202420252024
RSUs Granted:
Number of awards (in millions)0.01 0.03 0.3 0.7 
Weighted average grant date fair value per unit$210.84 $47.08 $123.27 $37.36 
PSUs Granted:
Number of awards (in millions, representing 100% of target)
0.01 0.01 0.2 0.5 
Weighted average grant date fair value per unit$266.99 $55.89 $149.29 $43.47 
DSUs Granted:
Number of awards (in millions)0.002 0.01 0.01 0.02 
Weighted average grant date fair value per unit$245.95 $51.32 $131.31 $50.10 
Schedule of Share-Based Payment Arrangement, Cost by Plan
Information regarding employee and director SBC expense and TRS FVAs (which represent changes in fair value of the TRS) for the periods indicated is set forth below:
Three months ended September 30Nine months ended September 30
 2025202420252024
Employee SBC expense in cost of sales$6.8 $5.6 $24.2 $20.2 
Employee SBC expense in SG&A8.8 7.1 32.6 27.1 
Total employee SBC expense$15.6 $12.7 $56.8 $47.3 
TRS FVAs: losses (gains) in cost of sales
$(48.5)$2.7 $(81.6)$(17.2)
TRS FVAs: losses (gains) in SG&A
(64.8)5.0 (110.0)(22.3)
Total TRS FVAs: losses (gains)
$(113.3)$7.7 $(191.6)$(39.5)
Combined effect of employee SBC expense and TRS FVAs$(97.7)$20.4 $(134.8)$7.8 
Director SBC expense in SG&A(1)
$0.6 $0.6 $1.7 $1.8 
(1) Expense consists of director compensation to be settled with Common Shares, or Common Shares and cash.