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Defined benefit pension plans (Tables)
3 Months Ended
Mar. 31, 2025
Defined Benefit Pension Plans  
Defined benefit pension plans [Line Items]  
Schedule of Components of Net Periodic Defined Benefit Cost

Three months ended

March 31, 

    

2024

    

2025

(In millions)

Service cost

$

1.7

$

1.4

Interest cost

5.4

5.2

Expected return on plan assets

 

(5.6)

 

(5.1)

Recognized net actuarial losses

 

.9

 

.6

Total

$

2.4

$

2.1