Segment Reporting - Condensed Consolidated Income Statement (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Disclosure of operating segments [line items] | |||||
| Revenue | $ 315.2 | $ 437.7 | $ 644.3 | $ 881.7 | $ 1,559.2 |
| Operating expenses | (64.3) | (62.7) | (130.7) | (119.3) | (245.1) |
| Profit from sale of vessels | 5.4 | 10.5 | 14.9 | 27.6 | 51.3 |
| Administrative expenses | (24.5) | (23.8) | (50.5) | (50.0) | (95.6) |
| Other operating income and expenses | (0.1) | (0.2) | (0.3) | (0.4) | (0.5) |
| Depreciation and amortization | (52.2) | (46.8) | (105.4) | (89.9) | (192.0) |
| Operating profit (EBIT) | 74.6 | 204.3 | 157.0 | 427.0 | 658.8 |
| Financial income | 3.6 | 7.7 | 7.5 | 14.1 | 24.8 |
| Financial expenses | (17.8) | (18.9) | (35.7) | (37.2) | (74.1) |
| Profit before tax | 60.4 | 193.1 | 128.8 | 403.9 | 609.5 |
| Tax | (1.7) | 1.1 | (7.2) | (0.5) | 2.0 |
| Net profit for the period | 58.7 | 194.2 | 121.6 | 403.4 | 611.5 |
| Operating segments | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | 315.2 | 437.7 | 644.3 | 881.7 | 1,559.2 |
| Port expenses, bunkers and commissions | (103.0) | (108.4) | (202.3) | (218.0) | (409.2) |
| Other cost of goods and services sold | (1.9) | (2.0) | (13.0) | (4.7) | (9.3) |
| Operating expenses | (64.3) | (62.7) | (130.7) | (119.3) | (245.1) |
| Profit from sale of vessels | 5.4 | 10.5 | 14.9 | 27.6 | 51.3 |
| Administrative expenses | (24.5) | (23.8) | (50.5) | (50.0) | (95.6) |
| Other operating income and expenses | (0.1) | (0.2) | (0.3) | (0.4) | (0.5) |
| Depreciation and amortization | (52.2) | (46.8) | (105.4) | (89.9) | (192.0) |
| Operating profit (EBIT) | 74.6 | 204.3 | 157.0 | 427.0 | 658.8 |
| Financial income | 3.6 | 7.7 | 7.5 | 14.1 | 24.8 |
| Financial expenses | (17.8) | (18.9) | (35.7) | (37.2) | (74.1) |
| Profit before tax | 60.4 | 193.1 | 128.8 | 403.9 | 609.5 |
| Tax | (1.7) | 1.1 | (7.2) | (0.5) | 2.0 |
| Net profit for the period | 58.7 | 194.2 | 121.6 | 403.4 | 611.5 |
| Operating segments | Tanker segment | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | 311.2 | 434.3 | 624.5 | 874.6 | 1,544.0 |
| Port expenses, bunkers and commissions | (103.0) | (108.4) | (202.3) | (218.0) | (409.2) |
| Other cost of goods and services sold | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Operating expenses | (64.7) | (62.9) | (131.2) | (119.6) | (245.6) |
| Profit from sale of vessels | 4.9 | 10.5 | 14.0 | 27.6 | 51.3 |
| Administrative expenses | (22.3) | (21.8) | (46.4) | (46.1) | (87.9) |
| Other operating income and expenses | (0.1) | (0.2) | (0.3) | (0.5) | (0.6) |
| Depreciation and amortization | (51.9) | (46.7) | (104.9) | (89.7) | (191.2) |
| Operating profit (EBIT) | 74.1 | 204.8 | 153.4 | 428.3 | 660.8 |
| Financial income | 3.6 | 7.6 | 7.4 | 13.9 | 24.7 |
| Financial expenses | (17.8) | (18.8) | (35.6) | (37.0) | (73.9) |
| Profit before tax | 59.9 | 193.6 | 125.2 | 405.2 | 611.6 |
| Tax | (1.6) | 1.1 | (6.5) | 0.0 | 2.5 |
| Net profit for the period | 58.3 | 194.7 | 118.7 | 405.2 | 614.1 |
| Operating segments | Marine Engineering segment | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | 8.9 | 9.0 | 28.5 | 14.6 | 29.6 |
| Port expenses, bunkers and commissions | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other cost of goods and services sold | (5.2) | (6.0) | (18.7) | (9.7) | (18.5) |
| 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 | (2.2) | (2.0) | (4.1) | (3.9) | (7.7) |
| Other operating income and expenses | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 |
| Depreciation and amortization | (0.3) | (0.1) | (0.5) | (0.2) | (0.8) |
| Operating profit (EBIT) | 1.2 | 0.9 | 5.2 | 0.9 | 2.7 |
| Financial income | 0.0 | 0.1 | 0.1 | 0.2 | 0.1 |
| Financial expenses | 0.0 | (0.1) | (0.1) | (0.2) | (0.2) |
| Profit before tax | 1.2 | 0.9 | 5.2 | 0.9 | 2.6 |
| Tax | (0.1) | 0.0 | (0.7) | (0.5) | (0.5) |
| Net profit for the period | 1.1 | 0.9 | 4.5 | 0.4 | 2.1 |
| Inter-segment elimination | |||||
| Disclosure of operating segments [line items] | |||||
| Revenue | (4.9) | (5.6) | (8.7) | (7.5) | (14.4) |
| Port expenses, bunkers and commissions | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other cost of goods and services sold | 3.3 | 4.0 | 5.7 | 5.0 | 9.2 |
| Operating expenses | 0.4 | 0.2 | 0.5 | 0.3 | 0.5 |
| Profit from sale of vessels | 0.5 | 0.0 | 0.9 | 0.0 | 0.0 |
| 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) | (0.7) | (1.4) | (1.6) | (2.2) | (4.7) |
| 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 | (0.7) | (1.4) | (1.6) | (2.2) | (4.7) |
| Tax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Net profit for the period | $ (0.7) | $ (1.4) | $ (1.6) | $ (2.2) | $ (4.7) |