Employee Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Schedule of Costs of Retirement Plans [Table Text Block]

Amounts related to our employee retirement plans are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in millions)
Defined contribution expense	$	2.6	$	2.2	$	5.0	$	4.3
Net periodic benefit cost – Supplemental Executive Retirement Plan (1)	$	0.1	$	0.1	$	0.3	$	0.3

(1) The non-service cost components of net periodic benefit cost are included in other, net (income) expense in our Consolidated Statements of Operations.