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Defined benefit pension plans (Tables)
3 Months Ended
Mar. 31, 2024
Defined Benefit Pension Plans  
Defined benefit pension plans [Line Items]  
Components of Net Periodic Defined Benefit Cost

The components of our net periodic defined benefit pension cost are presented in the table below.

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Three months ended

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March 31, 

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2023

    

2024

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​

(In millions)

Service cost

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$

1.6

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$

1.7

Interest cost

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​

5.6

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​

5.4

Expected return on plan assets

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(5.2)

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(5.6)

Recognized net actuarial losses

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.9

​

 

.9

Total

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$

2.9

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$

2.4