Three Months Ended
September 30,

Nine Months Ended
September 30,

2024

2023

2024

2023

Components of net periodic pension benefit cost

Service cost

$

1.6

$

1.7

$

4.7

$

5.0

Interest cost

4.1

4.2

12.5

12.5

Expected return on plan assets

(5.2

)

(4.8

)

(15.5

)

(14.5

)

Amortization of prior service cost

0.5

0.4

1.3

1.4

Amortization of net actuarial gain

(0.6

)

(0.6

)

(1.9

)

(1.8

)

Expenses paid

0.2

0.2

0.5

0.7

Net periodic pension benefit cost

$

0.6

$

1.1

$

1.6

$

3.3

Components of net periodic post-employment benefit cost

Service cost

$

0.4

$

0.5

$

1.3

$

1.3

Interest cost

0.6

0.5

1.8

1.6

Amortization of prior service credit

(0.4

)

(0.4

)

(1.1

)

(1.1

)

Amortization of net actuarial gain

—

—

—

(0.1

)

Net periodic post-employment benefit cost

$

0.6

$

0.6

$

2.0

$

1.7