Segment Reporting - Condensed Consolidated Income Statement (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Disclosure of operating segments [line items] | |||||
| Revenue | $ 662.8 | $ 315.2 | $ 1,064.8 | $ 644.3 | $ 1,339.5 |
| Operating expenses | (72.6) | (64.3) | (140.3) | (130.7) | (252.4) |
| Profit from sale of vessels | 0.0 | 5.4 | 4.0 | 14.9 | 19.0 |
| Administrative expenses | (24.2) | (24.5) | (47.2) | (50.5) | (113.8) |
| Other operating income and expenses | (0.4) | (0.1) | (0.3) | (0.3) | 0.1 |
| Depreciation and amortization | (60.5) | (52.2) | (120.1) | (105.4) | (214.5) |
| Operating profit (EBIT) | 355.1 | 74.6 | 496.4 | 157.0 | 356.3 |
| Financial income | 2.3 | 3.6 | 3.9 | 7.5 | 13.3 |
| Financial expenses | (18.3) | (17.8) | (37.2) | (35.7) | (74.4) |
| Profit before tax | 339.1 | 60.4 | 463.1 | 128.8 | 295.2 |
| Tax | (0.8) | (1.7) | (2.4) | (7.2) | (9.2) |
| Net profit for the period | 338.3 | 58.7 | 460.7 | 121.6 | 286.0 |
| Operating segments | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | 662.8 | 315.2 | 1,064.8 | 644.3 | 1,339.5 |
| Port expenses, bunkers and commissions | (146.8) | (103.0) | (256.5) | (202.3) | (404.5) |
| Other cost of goods and services sold | (3.2) | (1.9) | (8.0) | (13.0) | (17.1) |
| Operating expenses | (72.6) | (64.3) | (140.3) | (130.7) | (252.4) |
| Profit from sale of vessels | 0.0 | 5.4 | 4.0 | 14.9 | 19.0 |
| Administrative expenses | (24.2) | (24.5) | (47.2) | (50.5) | (113.8) |
| Other operating income and expenses | (0.4) | (0.1) | (0.3) | (0.3) | 0.1 |
| Depreciation and amortization | (60.5) | (52.2) | (120.1) | (105.4) | (214.5) |
| Operating profit (EBIT) | 355.1 | 74.6 | 496.4 | 157.0 | 356.3 |
| Financial income | 2.3 | 3.6 | 3.9 | 7.5 | 13.3 |
| Financial expenses | (18.3) | (17.8) | (37.2) | (35.7) | (74.4) |
| Profit before tax | 339.1 | 60.4 | 463.1 | 128.8 | 295.2 |
| Tax | (0.8) | (1.7) | (2.4) | (7.2) | (9.2) |
| Net profit for the period | 338.3 | 58.7 | 460.7 | 121.6 | 286.0 |
| Operating segments | Tanker segment | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | 658.8 | 311.2 | 1,054.6 | 624.5 | 1,314.2 |
| Port expenses, bunkers and commissions | (146.8) | (103.0) | (256.5) | (202.3) | (404.5) |
| Other cost of goods and services sold | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Operating expenses | (72.9) | (64.7) | (140.7) | (131.2) | (253.1) |
| Profit from sale of vessels | 0.0 | 4.9 | 4.0 | 14.0 | 17.8 |
| Administrative expenses | (22.2) | (22.3) | (43.3) | (46.4) | (106.5) |
| Other operating income and expenses | (0.5) | (0.1) | (0.5) | (0.3) | 0.0 |
| Depreciation and amortization | (60.2) | (51.9) | (119.2) | (104.9) | (213.5) |
| Operating profit (EBIT) | 356.2 | 74.1 | 498.4 | 153.4 | 354.4 |
| Financial income | 2.3 | 3.6 | 3.9 | 7.4 | 13.1 |
| Financial expenses | (18.2) | (17.8) | (37.1) | (35.6) | (74.2) |
| Profit before tax | 340.3 | 59.9 | 465.2 | 125.2 | 293.3 |
| Tax | (0.9) | (1.6) | (2.6) | (6.5) | (8.5) |
| Net profit for the period | 339.4 | 58.3 | 462.6 | 118.7 | 284.8 |
| Operating segments | Marine Engineering segment | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | 6.9 | 8.9 | 15.0 | 28.5 | 37.2 |
| Port expenses, bunkers and commissions | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other cost of goods and services sold | (4.9) | (5.2) | (10.8) | (18.7) | (24.6) |
| Operating expenses | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Profit from sale of vessels | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Administrative expenses | (2.0) | (2.2) | (3.9) | (4.1) | (7.3) |
| Other operating income and expenses | 0.1 | 0.0 | 0.2 | 0.0 | 0.1 |
| Depreciation and amortization | (0.3) | (0.3) | (0.9) | (0.5) | (1.0) |
| Operating profit (EBIT) | (0.2) | 1.2 | (0.4) | 5.2 | 4.4 |
| Financial income | 0.0 | 0.0 | 0.0 | 0.1 | 0.2 |
| Financial expenses | (0.1) | 0.0 | (0.1) | (0.1) | (0.2) |
| Profit before tax | (0.3) | 1.2 | (0.5) | 5.2 | 4.4 |
| Tax | 0.1 | (0.1) | 0.2 | (0.7) | (0.7) |
| Net profit for the period | (0.2) | 1.1 | (0.3) | 4.5 | 3.7 |
| Inter-segment elimination | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | (2.9) | (4.9) | (4.8) | (8.7) | (11.9) |
| Port expenses, bunkers and commissions | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other cost of goods and services sold | 1.7 | 3.3 | 2.8 | 5.7 | 7.5 |
| Operating expenses | 0.3 | 0.4 | 0.4 | 0.5 | 0.7 |
| Profit from sale of vessels | 0.0 | 0.5 | 0.0 | 0.9 | 1.2 |
| Administrative expenses | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other operating income and expenses | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Operating profit (EBIT) | (0.9) | (0.7) | (1.6) | (1.6) | (2.5) |
| Financial income | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Financial expenses | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Profit before tax | (0.9) | (0.7) | (1.6) | (1.6) | (2.5) |
| Tax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Net profit for the period | $ (0.9) | $ (0.7) | $ (1.6) | $ (1.6) | $ (2.5) |