Pension and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

Postemployment Benefits [Abstract]

Schedule of Components of Net Periodic (Income) Cost Associated with Pension Plans and Postretirement Benefit Obligations

The following table sets forth the components of the net periodic cost (income) associated with our pension plans and our postretirement benefit obligations:

	Pension Plans								Postretirement Benefit Obligations
	Three months ended June 30,				Six months ended June 30,				Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020		2021		2020		2021		2020
Components of net periodic cost (income):
Service cost	$	1.3	$	0.5	$	2.6	$	0.9	$	—	$	—	$	—	$	—
Interest cost	6.9		10.4		13.7		20.9		—		—		—		—
Expected return on plan assets	(20.9)		(21.8)		(41.7)		(43.7)		—		—		—		—
Amortization of prior service cost (credit)	—		—		—		—		(0.1)		(0.1)		(0.2)		(0.2)
Amortization of actuarial loss (gain)	0.5		—		1.1		—		—		—		—		—
Net periodic cost (income)	$	(12.2)	$	(10.9)	$	(24.3)	$	(21.9)	$	(0.1)	$	(0.1)	$	(0.2)	$	(0.2)