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Retirement benefits (Tables)
 9 Months Ended
Sep. 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 September 30,      
Service cost$— — 2.2 2.1 2.2 2.1 
Interest cost on projected benefit obligation7.8 7.7 4.6 4.4 12.4 12.1 
Return on assets – expected(11.1)(11.6)(3.0)(2.9)(14.1)(14.5)
Amortization of losses1.2 1.2 0.8 0.6 2.0 1.8 
Amortization of prior service credit— — 0.1 0.1 0.1 0.1 
Settlement loss— — 0.3 0.6 0.3 0.6 
Net periodic pension cost (credit)
$(2.1)(2.7)5.0 4.9 2.9 2.2 
Nine months ended September 30,      
Service cost$— — 6.3 6.5 6.3 6.5 
Interest cost on projected benefit obligation23.5 23.1 13.3 13.3 36.8 36.4 
Return on assets – expected(33.4)(34.8)(8.6)(8.6)(42.0)(43.4)
Amortization of losses3.9 3.9 2.1 1.9 6.0 5.8 
Amortization of prior service cost— — 0.2 0.1 0.2 0.1 
Settlement loss— — 1.0 0.9 1.0 0.9 
Net periodic pension cost (credit)
$(6.0)(7.8)14.3 14.1 8.3 6.3 
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 September 30,      
Interest cost on accumulated postretirement benefit obligations$2.4 2.2 1.1 1.1 3.5 3.3 
Return on assets – expected(2.3)(2.6)— — (2.3)(2.6)
Amortization of losses0.5 0.1 0.8 1.2 1.3 1.3 
Amortization of prior service cost (credit)
(2.5)(2.4)(0.1)(0.1)(2.6)(2.5)
Net periodic postretirement cost (credit)
$(1.9)(2.7)1.8 2.2 (0.1)(0.5)
Nine months ended September 30,      
Service cost$— — 0.1 0.1 0.1 0.1 
Interest cost on accumulated postretirement benefit obligations7.2 7.4 3.3 3.5 10.5 10.9 
Return on assets – expected(7.2)(7.7)— — (7.2)(7.7)
Amortization of losses1.4 1.5 2.4 3.3 3.8 4.8 
Amortization of prior service cost (credit)
(7.6)(6.8)— — (7.6)(6.8)
Net periodic postretirement cost (credit)
$(6.2)(5.6)5.8 6.9 (0.4)1.3