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Defined benefit pension plans (Tables)
6 Months Ended
Jun. 30, 2025
Defined Benefit Pension Plans  
Defined benefit pension plans [Line Items]  
Schedule of Components of Net Periodic Defined Benefit Cost

Three months ended

Six months ended

June 30, 

June 30, 

    

2024

    

2025

    

2024

    

2025

(In millions)

Service cost

$

1.6

$

1.5

$

3.3

$

2.9

Interest cost

5.2

5.8

10.6

11.3

Expected return on plan assets

 

(5.6)

 

(5.9)

 

(11.2)

 

(11.4)

Recognized net actuarial losses

 

1.0

 

.9

 

1.9

 

1.6

Total

$

2.2

$

2.3

$

4.6

$

4.4