Three Months Ended

Nine Months Ended

September 30,

2024

2023

2024

2023

U.S. defined benefit plans:

Pension benefits

Service cost of benefits earned during the period

$

0.6

$

0.6

$

1.8

$

1.9

Interest cost on projected benefit obligation

4.2

4.3

12.6

12.8

Expected return on plan assets

(6.0

)

(6.3

)

(18.2

)

(18.8

)

Amortization of net actuarial loss

1.3

1.4

3.9

4.1

Net periodic pension cost

$

0.1

$

-

$

0.1

$

-

Retiree health and life insurance benefits

Interest cost on projected benefit obligation

$

0.6

$

0.7

$

1.6

$

2.1

Amortization of prior service credit

(0.1

)

(0.1

)

(0.2

)

(0.2

)

Amortization of net actuarial gain

(2.2

)

(1.4

)

(6.4

)

(4.3

)

Net periodic postretirement credit

$

(1.7

)

$

(0.8

)

$

(5.0

)

$

(2.4

)