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Defined benefit pension plans (Tables)
9 Months Ended
Sep. 30, 2024
Defined Benefit Pension Plans  
Defined benefit pension plans [Line Items]  
Components of Net Periodic Defined Benefit Cost

Three months ended

Nine months ended

September 30, 

September 30, 

    

2023

    

2024

    

2023

    

2024

(In millions)

Service cost

$

1.6

$

1.6

$

4.7

$

4.9

Interest cost

5.5

5.3

16.6

15.9

Expected return on plan assets

 

(5.1)

 

(5.5)

 

(15.5)

 

(16.7)

Recognized net actuarial losses

 

1.0

 

1.0

 

2.9

 

2.9

Settlements

6.2

Total

$

3.0

$

2.4

$

14.9

$

7.0