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Pension Benefits (Tables)
6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost associated with our U.S. pension plans are as follows:

 Quarter endedYear to date
 2024202320242023
Service cost$$$$
Interest cost10 11 21 21 
Expected return on plan assets(13)(13)(26)(25)
Amortization of net (gain) / loss(1)(1)
Amortization of prior service cost
Net periodic benefit cost (income)
$— $(1)$(1)$(2)