Pension and Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Net Pension and Postretirement Cost

Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three months ended March 31, 2024 and 2023 are set forth below (in millions):

	Three Months Ended March 31,
Pension benefits	2024		2023
Service cost	$	2.1	$	2.4
Interest cost	7.0		7.2
Expected return on plan assets	(7.7)		(7.2)
Amortization of net actuarial losses	2.2		2.0
Amortization of prior service cost	0.3		0.3
Net periodic pension cost	$	3.9	$	4.7

	Three Months Ended March 31,
Postretirement benefits	2024		2023
Service cost	$	0.1	$	—
Interest cost	0.4		0.3
Amortization of prior service cost	0.1		0.1
Net periodic postretirement benefit cost	$	0.6	$	0.4