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INCOME TAXES - Schedule of recognized tax losses and unrecognized tax attributes (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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