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Employee benefit plans (Tables)
9 Months Ended
Sep. 30, 2021
Employee benefit plans  
Summary of the components of net periodic benefit income

Three Months Ended September 30, 

Nine Months Ended September 30, 

2021

2020

2021

2020

Interest cost

$

3

$

4

$

10

$

13

Expected return on plan assets

(7)

(7)

(21)

(20)

Amortization of net loss

1

4

1

Expenses paid

1

1

2

2

Net periodic benefit income

$

(2)

$

(2)

$

(5)

$

(4)