BENEFIT PLANS: (Tables)

9 Months Ended

Sep. 30, 2024

Post retirement defined benefit plans and defined contribution plan

Components of net periodic benefit costs

Schedule of the components of net periodic benefit costs

The components of net periodic benefit costs for the nine-month period ended September 30, 2024 and 2023 are as follows (in millions):

(in millions)	2024		2023
Service cost	$	1.9	$	1.6
Interest cost		2.8		2.6
Expected return on plan assets		(4.7)		(4.2)
Amortization of prior service cost/(credit)		0.2		0.1
Amortization of net loss/(gain)		0.3		0.3
Net periodic benefit cost	$	0.5	$	0.4

Post-retirement health care plans

Components of net periodic benefit costs

Schedule of the components of net periodic benefit costs

The components of net periodic benefit cost for the nine-month period ended September 30, 2024 and 2023 are as follows (in millions):

(in millions)	2024		2023
Interest cost	$	1.5	$	1.6
Amortization of net loss (gain)		—		—
Amortization of prior service cost/(credit)		(*)		(*)
Net periodic benefit cost	$	1.5	$	1.6