Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2022

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of Net Benefit (Credits) Costs [Table Text Block]

The components of net periodic benefit cost (credit) are as follows:

	Pension Benefits
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(in millions)
Service cost	$	0.5	$	0.5	$	1.4	$	1.5
Interest cost	4.1		4.4		12.5		13.0
Expected asset return	(8.0)		(9.7)		(23.8)		(29.1)
Amortized loss	2.0		2.7		5.8		8.1
Net periodic benefit credit	$	(1.4)	$	(2.1)	$	(4.1)	$	(6.5)
	Other Postretirement Benefits
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(in millions)
Service cost	$	0.1	$	—	$	0.2	$	0.2
Interest cost	2.1		2.1		6.3		6.3
Amortized loss	0.2		0.4		0.4		1.2
Amortized prior service credit	(0.3)		(0.3)		(0.7)		(1.1)
Net periodic benefit cost	$	2.1	$	2.2	$	6.2	$	6.6