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Common stock and additional paid-in capital (Tables)
 12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Schedule of Stockholders Equity
(in millions)Number of shares outstandingAmount
Common shares and additional paid-in capital outstanding as at December 31, 202222.0 $635.3 
Settlement of RSUs0.1 — 
Exercise of stock options0.2 — 
Stock-based compensation - RSUs— 9.8 
Stock-based compensation - options— 3.6 
Payment to the holders of non-controlling interest in subsidiary— (0.4)
Common shares and additional paid-in capital outstanding as at December 31, 202322.3 648.3 
Settlement of RSUs0.9 — 
Issuance of common stock in connection with the ATM Program7.2 15.5 
Stock based compensation - PSUs— 0.1 
Stock based compensation - RSUs— 8.7 
Stock based compensation - options— 0.1 
Common shares and additional paid-in capital outstanding as at December 31, 202430.4 $672.7 
Share-Based Payment Arrangement, Option, Activity
A summary of stock option activities is as follows:
Number of stock optionsWeighted average exercise price
Balance, as at December 31, 2022546,092 35.68 
Grants136,063 46.08 
Cashless exercises(197,678)6.48 
Forfeitures/cancellations/expirations(19,640)78.40 
Balance, as at December 31, 2023464,837 50.72 
Cashless exercises(10,086)2.96 
Forfeitures/cancellations/expirations(220,312)41.78 
Balance, as at December 31, 2024234,439 61.17 
Exercisable stock options as at December 31, 2024183,103$64.31 
A summary of non-vested stock options for the year ended December 31, 2024 is shown below:
NumberWeighted average grant date fair value
Non-vested balance as at December 31, 2022155,8495.56 
Granted during the period136,063 3.33 
Vested during the period(58,274)5.69 
Forfeited during the period(14,294)5.88 
Non-vested balance, as at December 31, 2023219,344$55.13
Vested during the period(100,334)$61.64
Forfeited during the period(67,674)49.37 
Non-vested balance, as at December 31, 202451,336$49.99 
Share-Based Payment Arrangement, Option, Exercise Price Range
A summary of the outstanding stock options is as follows:
As at December 31, 2024
PlansRange of exercise pricesNumber of stock optionsWeighted-average remaining contractual life (years)Expiration year
Legacy Plans
$ 8.56 - 17.20
39,2855.87April 2030 - February 2031
LTIP Plan
46.16 - 105.60
195,1547.15August 2031 - January 2033
Total234,439
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions The assumptions used in the stock option pricing model for the grants during the previous year ended December 31, 2023 were as follows:
Risk free interest rate
3.45% - 3.59%
Expected life of options
6 years
Expected dividend yield0%
Expected stock price volatility
57.81% - 58.65%
Expected forfeiture rate0.19%
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
A summary of RSU activities is as follows:
Number of RSUsWeighted average share price on grant
Balance, as at December 31, 2022250,085 $69.52 
Granted1,192,667 15.84 
Vested and settled(103,462)69.60 
Forfeited/cancelled/expired(106,905)49.04 
Balance, as at December 31, 20231,232,385 19.33 
Granted1,858,220 5.39 
Vested and settled(912,571)14.44 
Forfeited/cancelled/expired(330,524)21.64 
Balance, as at December 31, 20241,847,510 $7.32 
Share-Based Payment Arrangement, Performance Shares, Activity
A summary of PSU activities is as follows:
Number of PSUsWeighted average share price on grant
Balance, as at December 31, 2023
Granted466,876 0.82 
Balance, as at December 31, 2024466,876 $0.82