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Retirement benefits
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Retirement benefits Retirement benefits
Pension plans

We have various defined-benefit pension plans covering eligible current and former employees.  Benefits under most plans are based on salary and years of service.

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 
The components of net periodic pension cost (credit) other than the service cost component are included in interest and other nonoperating income (expense) in the condensed consolidated statements of operations.

We did not make cash contributions to the primary U.S. pension plan in 2023 or the first three months of 2024. Based on current assumptions described in our Annual Report on Form 10-K for the year ended December 31, 2023, we do not expect to make contributions to the primary U.S. pension plan until 2027.

Retirement benefits other than pensions
We provide retirement healthcare benefits for eligible current and former U.S., Canadian, and Brazilian employees. Retirement benefits related to our former U.S. coal operations include medical benefits provided by the Pittston Coal Group Companies Employee Benefit Plan for United Mine Workers of America Represented Employees (the “UMWA plans”) as well as costs related to Black Lung obligations.

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 
The components of net periodic postretirement cost (credit) other than the service cost component are included in interest and other nonoperating income (expense) in the condensed consolidated statements of operations.