Pension and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2024

Retirement Benefits [Abstract]

Components of Net Periodic Benefit

For all plans, the components of net periodic benefit for the three months ended June 30, 2024, and 2023 are as follows:

	Pension				Postretirement
(in millions)	2024		2023		2024		2023
Service cost	$	0.6	$	0.4	$	—	$	—
Interest cost	0.5		0.6		0.2		0.2
Expected return on plan assets	(0.8)		(0.8)		—		—
Amortization of prior service cost	(0.2)		(0.2)		(0.2)		(0.2)
Amortization of net gain	—		—		(0.2)		(0.2)
Net periodic expense (benefit)	$	0.1	$	—	$	(0.2)	$	(0.2)

For all plans, the components of net periodic benefit for the six months ended June 30, 2024, and 2023 are as follows:

	Pension				Postretirement
(in millions)	2024		2023		2024		2023
Service cost	$	1.1	$	0.9	$	—	$	—
Interest cost	1.0		1.1		0.3		0.4
Expected return on plan assets	(1.6)		(1.6)		—		—
Amortization of prior service cost	(0.4)		(0.4)		(0.4)		(0.5)
Amortization of net loss (gain)	0.1		—		(0.4)		(0.3)
Net periodic expense (benefit)	$	0.2	$	—	$	(0.5)	$	(0.4)

Expected Contributions to Pension and Postretirement Plans

We expect to contribute the following to our pension and postretirement plans:

(in millions)	Pension		Postretirement
Expected contributions in 2024	$	2.0	$	1.3
Amounts contributed during the six months ended June 30, 2024	$	1.1	$	1.2