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INCOME TAXES - Schedule of recognized tax losses and unrecognized tax attributes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Significant Accounting Policies    
Amount of losses $ 166.8 $ 274.9
Amount of deferred tax assets relating to losses 48.7 32.8
Unused tax losses carried forward, for which no deferred tax assets were recognized 166.8 274.9
Other temporary differences, for which no deferred tax assets were recognized 1,128.8 797.1
Unrecognized net deferred tax assets 262.7 227.0
Canada    
Significant Accounting Policies    
Amount of losses 70.5 23.0
Amount of deferred tax assets relating to losses 13.5 6.0
Unused tax losses carried forward, for which no deferred tax assets were recognized 70.5 23.0
France    
Significant Accounting Policies    
Amount of losses 32.4 59.8
Amount of deferred tax assets relating to losses 8.1 15.0
Unused tax losses carried forward, for which no deferred tax assets were recognized 32.4 59.8
Sweden    
Significant Accounting Policies    
Amount of losses 51.8 0.0
Amount of deferred tax assets relating to losses 10.7 0.0
Unused tax losses carried forward, for which no deferred tax assets were recognized 51.8 0.0
The United States    
Significant Accounting Policies    
Amount of losses 52.2 36.9
Amount of deferred tax assets relating to losses 14.0 7.9
Unused tax losses carried forward, for which no deferred tax assets were recognized 52.2 36.9
Austria    
Significant Accounting Policies    
Amount of losses 10.5 9.3
Amount of deferred tax assets relating to losses 2.4 2.1
Unused tax losses carried forward, for which no deferred tax assets were recognized 10.5 9.3
Other    
Significant Accounting Policies    
Amount of losses 0.0 0.0
Amount of deferred tax assets relating to losses 0.0 1.8
Unused tax losses carried forward, for which no deferred tax assets were recognized $ 0.0 $ 0.0