Three Months Ended

March 31,

2023

2022

U.S. defined benefit plans:

Pension benefits

Service cost of benefits earned during the period

$

0.7

$

0.9

Interest cost on projected benefit obligation

4.2

2.7

Expected return on plan assets

(6.2

)

(4.6

)

Amortization of net actuarial loss

1.3

1.0

Net periodic pension cost

$

-

$

-

Retiree health and life insurance benefits

Interest cost on projected benefit obligation

$

0.7

$

0.4

Amortization of prior service credit

-

(0.1

)

Amortization of net actuarial gain

(1.5

)

(0.7

)

Net periodic postretirement (credit)

$

(0.8

)

$

(0.4

)