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Pension and Postretirement Benefit Costs (Tables)
 9 Months Ended
Sep. 30, 2018
Defined benefit pension plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
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
Postretirement benefit plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
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