Employee Benefit Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2022

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,
	2022			2021
Service cost	$	4.9		$	5.4
Interest cost		8.7			7.4
Expected return on plan assets		(13.9	)		(15.8	)
Net amortization of unrecognized amounts
Prior service cost		0.9			1.0
Actuarial loss		0.8			2.5
Net periodic benefit cost	$	1.4		$	0.5