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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
After-tax components of comprehensive income (loss)
The following table sets forth the after-tax components of accumulated other comprehensive (loss) income and changes thereto:
 
Foreign
Currency
Translation
Adjustment
 
Net
Actuarial Loss
Associated with
Postretirement
Plans and
Workers’
Compensation
Obligations
 
Prior Service
Credit (Cost) Associated
with
Postretirement
Plans
 
Cash Flow
Hedges
 
Total
Accumulated
Other
Comprehensive (Loss)
Income
 
(Dollars in millions)
Predecessor Company
 
 
 
 
 
 
 
 
 
December 31, 2016
$
(148.2
)
 
$
(256.3
)
 
$
21.7

 
$
(94.2
)
 
$
(477.0
)
Reclassification from other comprehensive income to earnings
—

 
5.8

 
(1.4
)
 
18.6

 
23.0

Current period change
5.5

 
—

 
—

 
—

 
5.5

Fresh start reporting adjustment
142.7

 
250.5

 
(20.3
)
 
75.6

 
448.5

April 1, 2017
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Successor Company
 
 
 
 
 
 
 
 
 
Current period change
1.4

 
—

 
—

 
—

 
1.4

December 31, 2017
1.4

 
—

 
—

 
—

 
1.4

Current period change
(5.9
)
 
—

 
44.6

 
—

 
38.7

December 31, 2018
(4.5
)
 
—

 
44.6

 
—

 
40.1

Reclassification from other comprehensive income to earnings
—

 
—

 
(8.7
)
 
—

 
(8.7
)
Current period change
0.2

 
—

 
—

 
—

 
0.2

December 31, 2019
$
(4.3
)
 
$
—

 
$
35.9

 
$
—

 
$
31.6
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] The following table provides additional information regarding items reclassified out of “Accumulated other comprehensive income” into earnings during the periods presented below:
 
 
Amount reclassified from accumulated other comprehensive loss (1)
 
 
 
Successor
Predecessor
 
Details about accumulated other comprehensive loss components
 
Year Ended December 31, 2019
January 1 through April 1, 2017
 
Affected line item in the consolidated statement of operations
 
(Dollars in millions)
 
Net actuarial loss associated with postretirement plans and workers’ compensation obligations:
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
—

$
(5.5
)
 
Net periodic benefit costs, excluding service cost
Defined benefit pension plans
 
—

(6.3
)
 
Net periodic benefit costs, excluding service cost
Workers’ compensation amortization
 
—

2.7

 
Net periodic benefit costs, excluding service cost
 
 
—

(9.1
)
 
Total before income taxes
 
 
—

3.3

 
Income tax benefit
 
 
$
—

$
(5.8
)
 
Total after income taxes
 
 
 
 
 
 
Prior service credit (cost) associated with postretirement plans:
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
8.7

$
2.3

 
Net periodic benefit costs, excluding service cost
Defined benefit pension plans
 
—

(0.1
)
 
Net periodic benefit costs, excluding service cost
 
 
8.7

2.2

 
Total before income taxes
 
 
—

(0.8
)
 
Income tax provision
 
 
$
8.7

$
1.4

 
Total after income taxes
 
 
 
 
 
 
Cash flow hedges:
 
 
 
 
 
Foreign currency cash flow hedge contracts
 
$
—

$
(16.6
)
 
Operating costs and expenses
Fuel and explosives commodity swaps
 
—

(11.0
)
 
Operating costs and expenses
Insignificant items
 
—

(0.1
)
 
 
 
 
—

(27.7
)
 
Total before income taxes
 
 
—

9.1

 
Income tax benefit
 
 
$
—

$
(18.6
)
 
Total after income taxes
(1)    Presented as gains (losses) in the consolidated statements of operations.