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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
(Loss) income from continuing operations before income taxes
(Loss) income from continuing operations before income taxes for the periods presented below consisted of the following:
 
Successor
Predecessor
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
U.S. 
$
(374.2
)
 
$
(43.4
)
 
$
10.4

$
2,408.7

Non-U.S. 
231.9

 
707.5

 
541.7

(2,868.0
)
Total
$
(142.3
)
 
$
664.1

 
$
552.1

$
(459.3
)

Components of income tax provision (benefit)
Total income tax provision (benefit) for the periods presented below consisted of the following:
 
Successor
Predecessor
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
Current:
 
 
 
 
 
 

U.S. federal
$
(21.5
)
 
$
(46.8
)
 
$
(101.4
)
$
(3.1
)
Non-U.S. 
28.4

 
29.8

 
40.4

8.3

State
(0.3
)
 
(0.1
)
 
(0.4
)
(6.7
)
Total current
6.6

 
(17.1
)
 
(61.4
)
(1.5
)
Deferred:
 
 
 
 
 

 

U.S. federal
20.3

 
30.4

 
(85.1
)
(101.0
)
Non-U.S. 
19.3

 
5.7

 
(14.5
)
(160.4
)
State
(0.2
)
 
(0.6
)
 

(0.9
)
Total deferred
39.4

 
35.5

 
(99.6
)
(262.3
)
Total income tax provision (benefit)
$
46.0

 
$
18.4

 
$
(161.0
)
$
(263.8
)

Reconciliation of the expected statutory federal income tax provision (benefit) to the Company's actual income tax provision
The following is a reconciliation of the expected statutory federal income tax (benefit) expense to the Company’s income tax provision (benefit) for the periods presented below:
 
Successor
Predecessor
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
Expected income tax (benefit) expense at U.S. federal statutory rate
$
(29.9
)
 
$
139.5

 
$
193.2

$
(160.8
)
Changes in valuation allowance, income tax
(32.0
)
 
(284.6
)
 
(744.9
)
(777.2
)
Remeasurement due to the Tax Cuts and Jobs Act

 
9.5

 
473.5


Reorganization costs

 

 

2,130.0

Bad debt deduction

 

 

(1,639.6
)
Changes in tax reserves
3.0

 
2.1

 
7.2

(9.2
)
Excess depletion
(19.3
)
 
(28.5
)
 
(40.4
)
(11.2
)
Foreign earnings repatriation
76.1

 

 


Foreign earnings provision differential
45.6

 
97.1

 
(26.3
)
158.2

Global intangible low-taxed income
6.1

 
68.2

 


Remeasurement of foreign income tax accounts
(0.1
)
 
(0.2
)
 
(0.3
)
9.4

State income taxes, net of federal tax benefit
(13.2
)
 
3.2

 
(3.1
)
40.6

Other, net
9.7

 
12.1

 
(19.9
)
(4.0
)
Total income tax provision (benefit)
$
46.0

 
$
18.4

 
$
(161.0
)
$
(263.8
)

Tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities
The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities as of December 31, 2019 and 2018 consisted of the following:
 
December 31,
 
2019
 
2018
 
(Dollars in millions)
Deferred tax assets:
 

 
 

Tax loss carryforwards and credits
$
1,530.9

 
$
1,729.3

Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments
276.6

 
304.5

Accrued postretirement benefit obligations
142.6

 
139.5

Asset retirement obligations
86.6

 
47.2

Employee benefits
25.3

 
24.8

Take or pay obligations
12.0

 
17.1

Investments and other assets
89.0

 
82.7

Workers’ compensation obligations
7.6

 
6.2

Operating lease right-of-use assets
20.8

 

Other
16.7

 
38.2

Total gross deferred tax assets
2,208.1

 
2,389.5

Valuation allowance, income tax
(2,068.4
)
 
(2,094.3
)
Total deferred tax assets
139.7

 
295.2

Deferred tax liabilities:
 

 
 

Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments
100.9

 
203.4

Operating lease liabilities
20.8

 

Coal supply agreements
3.1

 
9.3

Investments and other assets
15.4

 
43.7

Total deferred tax liabilities
140.2

 
256.4

Net deferred tax (liability) asset
$
(0.5
)
 
$
38.8

Deferred taxes are classified as follows:
 

 
 

Noncurrent deferred income tax asset
$
28.3

 
$
48.5

Noncurrent deferred income tax liability
(28.8
)
 
(9.7
)
Net deferred tax (liability) asset
$
(0.5
)
 
$
38.8


Summary of Income Tax Contingencies [Table Text Block]
Net unrecognized tax benefits (excluding interest and penalties) were recorded as follows in the consolidated balance sheets as of December 31, 2019 and 2018:
 
December 31,
 
2019
 
2018
 
(Dollars in millions)
Deferred income taxes
$
15.5

 
$
13.0

Other noncurrent liabilities
1.0

 
1.0

Net unrecognized tax benefits
$
16.5

 
$
14.0

Gross unrecognized tax benefits
$
16.5

 
$
14.0


Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the periods presented below is as follows:
 
Successor
Predecessor
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
Balance at beginning of period
$
14.0

 
$
12.7

 
$
12.5

$
20.1

Additions for current year tax positions
2.2

 
1.8

 
0.8


Additions (reductions) for prior year tax positions
0.3

 

 
(0.5
)
(7.6
)
Reductions for settlements with tax authorities

 
(0.5
)
 
(0.1
)

Balance at end of period
$
16.5

 
$
14.0

 
$
12.7

$
12.5


Summary of Companys tax (refunds) payments
The following table summarizes the Company’s income tax (refunds) payments, net for the periods presented below:
 
Successor
Predecessor
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
U.S. — federal
$
(45.7
)
 
$
(103.1
)
 
$
(11.2
)
$

U.S. — state and local
0.3

 
(1.6
)
 


Non-U.S. 
36.3

 
40.7

 
10.4

5.5

Total income tax (refunds) payments, net
$
(9.1
)
 
$
(64.0
)
 
$
(0.8
)
$
5.5