Three Months Ended

March 31,

2025

2024

U.S. defined benefit plans:

Pension benefits

Service cost of benefits earned during the period

$

0.6

$

0.6

Interest cost on projected benefit obligation

4.2

4.2

Expected return on plan assets

(5.6

)

(6.1

)

Amortization of net actuarial loss

1.3

1.3

Net periodic pension cost

$

0.5

$

-

Retiree health and life insurance benefits

Interest cost on projected benefit obligation

$

0.5

$

0.5

Amortization of prior service credit

-

(0.1

)

Amortization of net actuarial gain

(0.4

)

(2.1

)

Net periodic postretirement cost (credit)

$

0.1

$

(1.7

)