Defined Benefit and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Components of Net Periodic Benefit

For all plans, the components of net periodic benefit for the three months ended September 30, 2023, and 2022 are as follows:

	Pension				Postretirement
(in millions)	2023		2022		2023		2022
Service cost	$	0.5	$	0.6	$	—	$	—
Interest cost	0.5		0.2		0.2		0.2
Expected return on plan assets	(0.8)		(0.8)		—		—
Amortization of prior service cost	(0.1)		(0.1)		(0.3)		(0.3)
Amortization of net (gain) loss	—		0.3		(0.2)		—
Net periodic expense (benefit)	$	0.1	$	0.2	$	(0.3)	$	(0.1)

For all plans, the components of net periodic benefit for the nine months ended September 30, 2023, and 2022 are as follows:

	Pension				Postretirement
(in millions)	2023		2022		2023		2022
Service cost	$	1.4	$	1.7	$	—	$	0.1
Interest cost	1.6		0.6		0.6		0.5
Expected return on plan assets	(2.4)		(2.3)		—		—
Amortization of prior service cost	(0.5)		(0.5)		(0.8)		(0.8)
Amortization of net (gain) loss	—		0.7		(0.5)		—
Net periodic expense (benefit)	$	0.1	$	0.2	$	(0.7)	$	(0.2)

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 2023	$	2.6	$	1.5
Amounts contributed during the nine months ended September 30, 2023	$	2.1	$	1.4