Employee Benefit Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 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 September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
Service cost	$	4.6		$	5.4		$	14.4		$	16.0
Interest cost		8.6			7.4			26.0			22.2
Expected return on plan assets		(13.9	)		(15.8	)		(41.8	)		(47.3	)
Net amortization of unrecognized amounts
Prior service cost		0.9			1.0			2.7			2.9
Actuarial loss		0.9			2.6			2.6			7.8
Net periodic benefit cost	$	1.1		$	0.6		$	3.9		$	1.6