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Retirement benefits (Tables) | 6 Months Ended
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Jun. 30, 2026
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic pension cost (credit) for our pension plans were as follows:
| U.S. Plans |  | Non-U.S. Plans |  | Total
(In millions) | 2026 |  | 2025 |  | 2026 |  | 2025 |  | 2026 |  | 2025
Three months ended June 30, |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | — |  |  | 2.3 |  |  | 2.1 |  |  | 2.3 |  |  | 2.1 |
Interest cost on projected benefit obligation | 7.5 |  |  | 7.8 |  |  | 5.2 |  |  | 4.5 |  |  | 12.7 |  |  | 12.3 |
Return on assets – expected | (9.4) |  |  | (11.2) |  |  | (2.9) |  |  | (2.9) |  |  | (12.3) |  |  | (14.1) |
Amortization of losses | 2.6 |  |  | 1.4 |  |  | 0.9 |  |  | 0.7 |  |  | 3.5 |  |  | 2.1 |
Settlement loss | — |  |  | — |  |  | — |  |  | 0.4 |  |  | — |  |  | 0.4 |
Net periodic pension cost (credit) | $ | 0.7 |  |  | (2.0) |  |  | 5.5 |  |  | 4.8 |  |  | 6.2 |  |  | 2.8 |
Six months ended June 30, |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | — |  |  | 4.7 |  |  | 4.1 |  |  | 4.7 |  |  | 4.1 |
Interest cost on projected benefit obligation | 14.9 |  |  | 15.7 |  |  | 10.2 |  |  | 8.7 |  |  | 25.1 |  |  | 24.4 |
Return on assets – expected | (18.8) |  |  | (22.3) |  |  | (5.9) |  |  | (5.6) |  |  | (24.7) |  |  | (27.9) |
Amortization of losses | 5.0 |  |  | 2.7 |  |  | 1.9 |  |  | 1.3 |  |  | 6.9 |  |  | 4.0 |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |
Settlement loss | — |  |  | — |  |  | — |  |  | 0.7 |  |  | — |  |  | 0.7 |
Net periodic pension cost (credit) | $ | 1.1 |  |  | (3.9) |  |  | 10.9 |  |  | 9.3 |  |  | 12.0 |  |  | 5.4 |
Schedule of Costs of Retirement Plans | The components of net periodic postretirement cost (credit) related to retirement benefits other than pensions were as follows:
| UMWA Plans |  | Black Lung and Other Plans |  | Total
(In millions) | 2026 |  | 2025 |  | 2026 |  | 2025 |  | 2026 |  | 2025
Three months ended June 30, |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |
Interest cost on accumulated postretirement benefit obligations | 2.1 |  |  | 2.5 |  |  | 1.0 |  |  | 1.1 |  |  | 3.1 |  |  | 3.6 |
Return on assets – expected | (2.5) |  |  | (2.5) |  |  | — |  |  | — |  |  | (2.5) |  |  | (2.5) |
Amortization of losses | 0.2 |  |  | 0.6 |  |  | 0.7 |  |  | 0.8 |  |  | 0.9 |  |  | 1.4 |
Amortization of prior service cost (credit) | (1.4) |  |  | (2.5) |  |  | 0.1 |  |  | — |  |  | (1.3) |  |  | (2.5) |
Net periodic postretirement cost (credit) | $ | (1.6) |  |  | (1.9) |  |  | 1.8 |  |  | 2.0 |  |  | 0.2 |  |  | 0.1 |
Six months ended June 30, |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Interest cost on accumulated postretirement benefit obligations | 4.5 |  |  | 4.8 |  |  | 2.0 |  |  | 2.2 |  |  | 6.5 |  |  | 7.0 |
Return on assets – expected | (4.9) |  |  | (4.9) |  |  | — |  |  | — |  |  | (4.9) |  |  | (4.9) |
Amortization of losses | 0.7 |  |  | 0.9 |  |  | 1.4 |  |  | 1.7 |  |  | 2.1 |  |  | 2.6 |
Amortization of prior service cost (credit) | (2.8) |  |  | (5.1) |  |  | 0.1 |  |  | — |  |  | (2.7) |  |  | (5.1) |
Net periodic postretirement cost (credit) | $ | (2.5) |  |  | (4.3) |  |  | 3.6 |  |  | 4.0 |  |  | 1.1 |  |  | (0.3) |

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