Employee Retirement Plans (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Expense Components
Service cost	$	—	$	—	$	—	$	—
Interest	0.1		3.7		0.2		7.4
Expected return on plan assets	—		(5.2)		—		(10.4)
Amortization of actuarial loss	0.1		1.5		0.2		3.0
Amortization of prior service cost	—		0.3		—		0.6
Net periodic benefit cost	0.2		0.3		0.4		0.6
Profit sharing	2.4		1.9		5.2		4.6
Net expense	$	2.6	$	2.2	$	5.6	$	5.2