Employee Benefit Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Costs

The components of net periodic benefit cost for our pension plans were as follows (dollars in millions):

	Pension Plans
	Three Months Ended March 31,
	2024			2023
Service cost	$	3.1		$	3.6
Interest cost		13.9			14.0
Expected return on plan assets		(16.5	)		(14.3	)
Net amortization of unrecognized amounts
Prior service cost		1.4			1.3
Actuarial loss		0.2			1.1
Net periodic benefit cost	$	2.1		$	5.7