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Retirement benefits (Tables)
 3 Months Ended
Mar. 31, 2024
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)202420232024202320242023
Three months ended March 31,      
Service cost$— — 2.2 1.8 2.2 1.8 
Interest cost on projected benefit obligation7.7 8.1 4.5 4.4 12.2 12.5 
Return on assets – expected(11.6)(11.8)(2.9)(2.8)(14.5)(14.6)
Amortization of losses1.5 0.5 0.6 0.4 2.1 0.9 
Settlement loss— — 0.3 0.1 0.3 0.1 
Net periodic pension cost (credit)
$(2.4)(3.2)4.7 3.9 2.3 0.7 
Schedule of Costs of Retirement Plans
The components of net periodic postretirement cost (credit) related to retirement benefits other than pensions were as follows:
UMWA PlansBlack Lung and Other PlansTotal
(In millions)202420232024202320242023
Three months ended March 31,      
Service cost$— — 0.1 0.1 0.1 0.1 
Interest cost on accumulated postretirement benefit obligations2.6 3.0 1.3 1.3 3.9 4.3 
Return on assets – expected(2.5)(2.6)— — (2.5)(2.6)
Amortization of losses1.3 1.7 1.1 1.1 2.4 2.8 
Amortization of prior service credit
(2.8)(2.7)— — (2.8)(2.7)
Net periodic postretirement cost (credit)
$(1.4)(0.6)2.5 2.5 1.1 1.9