Pension and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

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-Month Period				Six-Month Period						Three-Month Period				Six-Month Period
	Successor								Predecessor		Successor								Predecessor
	Three Months Ended June 30, 2020		Three Months Ended June 30, 2019		Six Months Ended June 30, 2020		Period from January 1 to June 30, 2019		Period from January 1 to February 7, 2019		Three Months Ended June 30, 2020		Three Months Ended June 30, 2019		Six Months Ended June 30, 2020		Period from January 1 to June 30, 2019		Period from January 1 to February 7, 2019
Components of net periodic cost (income):
Service cost	$	0.5	$	0.4	$	0.9	$	0.6	$	0.3	$	—	$	—	$	—	$	—	$	—
Interest cost	10.4		13.1		20.9		20.4		6.8		—		0.1		—		0.1		—
Expected return on plan assets	(21.8)		(23.3)		(43.7)		(36.2)		(10.6)		—		—		—		—		—
Amortization of Prior Service Cost (Credit)	—		—		—		—		—		(0.1)		—		(0.2)		—		(0.1)
Recognized actuarial loss (gain)	—		—		—		—		4.0		—		—		—		—		(0.1)
Net periodic cost (income)	$	(10.9)	$	(9.8)	$	(21.9)	$	(15.2)	$	0.5	$	(0.1)	$	0.1	$	(0.2)	$	0.1	$	(0.2)