BENEFIT PLANS: (Tables)

3 Months Ended

Mar. 31, 2025

Defined contribution plan and post-retirement defined benefit plans

Components of net periodic benefit costs

Schedule of the components of net periodic benefit costs

The components of net periodic benefit costs for the three-month periods ended March 31, 2025 and 2024 are as follows (in millions):


		Three months ended
		March 31,
(in millions)		2025			2024
Service cost		$	0.6		$	0.7
Interest cost			0.9			0.9
Expected return on plan assets			(1.8)			(1.5)
Amortization of net loss/(gain)			0.1			(*)
Net periodic (benefit) cost		$	(0.2)		$	0.1

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 three-month period ended March 31, 2025 and 2024 are as follows (in millions):


		Three months ended March 31,
(in millions)		2025			2024
Interest cost		$	0.5		$	0.5
Amortization of net loss (gain)			(*)			(*)
Amortization of prior service cost/ (credit)			—			(*)
Net periodic benefit cost		$	0.5		$	0.5