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Pension and Postretirement Benefit Costs
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Pension and Postretirement Benefit Costs
Pension and Postretirement Benefit Costs
The components of net periodic pension and postretirement benefit costs, excluding the service cost for benefits earned, are included in “Net periodic benefit costs, excluding service cost” in the unaudited condensed consolidated statements of operations.
Net periodic pension (benefit) cost included the following components:
 
Successor
 
Successor
Predecessor
 
Three Months Ended September 30, 2018
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2018
 
April 2 through September 30, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
Service cost for benefits earned
$
0.6

 
$
0.5

 
$
1.7

 
$
1.1

$
0.6

Interest cost on projected benefit obligation
7.9

 
9.4

 
23.6

 
18.7

9.7

Expected return on plan assets
(10.7
)
 
(11.2
)
 
(32.1
)
 
(22.4
)
(11.0
)
Amortization of prior service cost and net actuarial loss
—

 
—

 
—

 
—

6.4

Net periodic pension (benefit) cost
$
(2.2
)
 
$
(1.3
)
 
$
(6.8
)
 
$
(2.6
)
$
5.7


Annual contributions to the qualified plans are made in accordance with minimum funding standards and the Company’s agreement with the Pension Benefit Guaranty Corporation. Funding decisions also consider certain funded status thresholds defined by the Pension Protection Act of 2006 (generally 80%). As of September 30, 2018, the Company’s qualified plans were expected to be at or above the Pension Protection Act thresholds. Minimum funding standards are legislated by ERISA and are modified by pension funding stabilization provisions included in the Moving Ahead for Progress in the 21st Century Act of 2012, the Highway and Transportation Funding Act of 2014 and the Bipartisan Budget Act of 2015. Based upon minimum funding requirements, the Company is not required to make any contributions to its qualified pension plans in 2018; however, during the three and nine months ended September 30, 2018, the Company made discretionary contributions of $20.0 million and $62.0 million, respectively, to its qualified pension plans.
Prior to emergence from the Chapter 11 Cases, the Company incurred pension costs for two non-qualified pension plans which it no longer sponsors.
Net periodic postretirement benefit cost included the following components:
 
Successor
 
Successor
Predecessor
 
Three Months Ended September 30, 2018
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2018
 
April 2 through September 30, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
Service cost for benefits earned
$
2.1

 
$
2.3

 
$
6.2

 
$
4.6

$
2.3

Interest cost on accumulated postretirement benefit obligation
7.0

 
8.2

 
21.2

 
16.5

8.4

Amortization of prior service cost and net actuarial loss
—

 
—

 
—

 
—

3.2

Net periodic postretirement benefit cost
$
9.1

 
$
10.5

 
$
27.4

 
$
21.1

$
13.9