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Unaudited Consolidated Statements of Changes in Shareholders’ Equity - USD ($)
$ in Millions
Total
Common shares
Treasury shares
Additional paid in capital
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2021   136,811,842      
Beginning balance at Dec. 31, 2021 $ 889.9 $ 13.8 $ (13.7) $ 1,978.0 $ (1,088.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issue of common shares (in shares)   14,840,323      
Issue of common shares 35.2 $ 1.5   33.7  
Equity issuance costs (1.1)     (1.1)  
Share-based compensation 0.3     0.3  
Total comprehensive loss (51.3)       (51.3)
Ending balance (in shares) at Mar. 31, 2022   151,652,165      
Ending balance at Mar. 31, 2022 873.0 $ 15.3 (13.7) 2,010.9 (1,139.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issue of common shares (in shares)   843,010      
Issue of common shares 3.7 $ 0.1   3.6  
Equity issuance costs (0.1)     (0.1)  
Share-based compensation 0.2     0.2  
Total comprehensive loss (165.3)       (165.3)
Ending balance (in shares) at Jun. 30, 2022   152,495,175      
Ending balance at Jun. 30, 2022 711.5 $ 15.4 (13.7) 2,014.6 (1,304.8)
Beginning balance (in shares) at Dec. 31, 2022   228,948,087      
Beginning balance at Dec. 31, 2022 897.8 $ 23.0 (9.8) 2,265.6 (1,381.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issue of common shares (in shares)   15,000,000      
Issue of common shares 1.5 $ 2.5 (1.0) 0.0  
Convertible debt issuance cost 10.9        
Share-based compensation 1.3     1.3  
Total comprehensive loss (7.4)       (7.4)
Ending balance (in shares) at Mar. 31, 2023   243,948,087      
Ending balance at Mar. 31, 2023 904.1 $ 25.5 (10.8) 2,277.8 (1,388.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issue of common shares (in shares)   1,154,645      
Issue of common shares 0.0   0.1 (0.1)  
Share-based compensation 1.3     1.3  
Total comprehensive loss 0.8       0.8
Ending balance (in shares) at Jun. 30, 2023   245,102,732      
Ending balance at Jun. 30, 2023 $ 906.2 $ 25.5 $ (10.7) $ 2,279.0 $ (1,387.6)