Employee Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2020

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,
	2020		2019		2020		2019
	(in millions)
Expense Components
Service cost	$	—	$	0.1	$	—	$	0.1
Interest	3.7		4.9		7.4		9.8
Expected return on plan assets	(5.2)		(5.8)		(10.4)		(11.5)
Amortization of actuarial loss	1.5		1.1		3.0		2.2
Amortization of prior service cost	0.3		—		0.6		—
Net periodic benefit cost	0.3		0.3		0.6		0.6
Profit sharing	1.9		3.0		4.6		5.2
Net expense	$	2.2	$	3.3	$	5.2	$	5.8