Employee Benefit Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2023

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,
	2023			2022
Service cost	$	3.6		$	4.9
Interest cost		14.0			8.7
Expected return on plan assets		(14.3	)		(13.9	)
Net amortization of unrecognized amounts
Prior service cost		1.3			0.9
Actuarial loss		1.1			0.8
Net periodic benefit cost	$	5.7		$	1.4