Employee Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Costs of Retirement Plans [Table Text Block]

The following table summarizes the components of our net retirement cost:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(in millions)
Expense Components
Service cost	$	—	$	—	$	—	$	—
Interest	0.1		3.8		0.3		11.2
Expected return on plan assets	—		(5.3)		—		(15.7)
Amortization of actuarial loss	—		1.5		0.2		4.5
Amortization of prior service cost	—		0.3		—		0.9
Net periodic benefit cost	0.1		0.3		0.5		0.9
Profit sharing	3.1		1.9		8.3		6.5
Net expense	$	3.2	$	2.2	$	8.8	$	7.4