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Common stock and additional paid-in capital
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Common stock and additional paid-in capital Common stock and additional paid-in capital
The following details the changes in issued and outstanding common shares for the three months ended March 31, 2024.
(in millions)Number of shares outstandingAmount
Common shares and additional paid-in capital outstanding as at December 31, 2023$178.2 $648.3 
Settlement of RSUs0.9 — 
Stock-based compensation – RSUs— 2.7 
Stock-based compensation – options— 0.6 
Common shares and additional paid-in capital outstanding as at March 31, 2024$179.1 $651.6