v3.25.2
Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2025
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. PlansNon-U.S. PlansTotal
(In millions)202520242025202420252024
Three months ended June 30,      
Service cost$— — 2.1 2.2 2.1 2.2 
Interest cost on projected benefit obligation7.8 7.7 4.5 4.4 12.3 12.1 
Return on assets – expected(11.2)(11.6)(2.9)(2.8)(14.1)(14.4)
Amortization of losses1.4 1.2 0.7 0.7 2.1 1.9 
Settlement loss— — 0.4 — 0.4 — 
Net periodic pension cost (credit)
$(2.0)(2.7)4.8 4.5 2.8 1.8 
Six months ended June 30,      
Service cost$— — 4.1 4.4 4.1 4.4 
Interest cost on projected benefit obligation15.7 15.4 8.7 8.9 24.4 24.3 
Return on assets – expected(22.3)(23.2)(5.6)(5.7)(27.9)(28.9)
Amortization of losses2.7 2.7 1.3 1.3 4.0 4.0 
Amortization of prior service cost— — 0.1 — 0.1 — 
Settlement loss— — 0.7 0.3 0.7 0.3 
Net periodic pension cost (credit)
$(3.9)(5.1)9.3 9.2 5.4 4.1 
Schedule of Costs of Retirement Plans
The components of net periodic postretirement cost (credit) related to retirement benefits other than pensions were as follows:
UMWA PlansBlack Lung and Other PlansTotal
(In millions)202520242025202420252024
Three months ended June 30,      
Service cost$— — 0.1 — 0.1 — 
Interest cost on accumulated postretirement benefit obligations2.5 2.6 1.1 1.1 3.6 3.7 
Return on assets – expected(2.5)(2.6)— — (2.5)(2.6)
Amortization of losses0.6 0.1 0.8 1.0 1.4 1.1 
Amortization of prior service cost (credit)
(2.5)(1.6)— 0.1 (2.5)(1.5)
Net periodic postretirement cost (credit)
$(1.9)(1.5)2.0 2.2 0.1 0.7 
Six months ended June 30,      
Service cost$— — 0.1 0.1 0.1 0.1 
Interest cost on accumulated postretirement benefit obligations4.8 5.2 2.2 2.4 7.0 7.6 
Return on assets – expected(4.9)(5.1)— — (4.9)(5.1)
Amortization of losses0.9 1.4 1.7 2.1 2.6 3.5 
Amortization of prior service cost (credit)
(5.1)(4.4)— 0.1 (5.1)(4.3)
Net periodic postretirement cost (credit)
$(4.3)(2.9)4.0 4.7 (0.3)1.8