Pension Plans (Tables)

6 Months Ended

Jun. 30, 2024

Retirement Benefits [Abstract]

Schedule of Defined Benefit Pension Plans and Postretirement Benefit Plans

	Second Quarter				Six Months
	2024		2023		2024		2023
Service cost — benefits earned during the period (in millions)	$	1.5	$	1.5	$	3.0	$	3.0
Pension non-service cost (income) (in millions):
Interest cost on benefit obligation	$	8.1	$	8.4	$	16.3	$	16.8
Expected return on plan assets	(13.5)		(13.5)		(27.1)		(27.1)
Amortization of net prior service cost (income)	(0.2)		(0.4)		(0.4)		(0.9)
Amortization of net actuarial loss (gain)	2.9		2.6		5.8		5.0
Pension non-service cost (income)	$	(2.7)	$	(2.9)	$	(5.4)	$	(6.2)