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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
After-tax components of comprehensive income (loss)
The following table sets forth the after-tax components of accumulated other comprehensive income and changes thereto recorded during the three months ended March 31, 2018:
 
 
Foreign Currency Translation
Adjustment
 
Total Accumulated Other Comprehensive Income
 
 
(Dollars in millions)
 
December 31, 2017
$
1.4

 
$
1.4

 
Current period change
(0.8
)
 
(0.8
)
 
March 31, 2018
$
0.6

 
$
0.6
Reclassification out of accumulated other comprehensive income (loss)
The following table provides additional information regarding items reclassified out of “Accumulated other comprehensive income (loss)” into earnings during the period presented below:
 
 
Amount reclassified from accumulated other comprehensive income (loss) (1)
 
 
 
 
Predecessor
 
 
Details about accumulated other comprehensive income (loss) components

 
Three Months Ended March 31, 2017
 
Affected line item in the unaudited condensed 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
Insignificant items
 
2.7

 
 
 
 
(9.1
)
 
Total before income taxes
 
 
3.3

 
Income tax benefit
 
 
$
(5.8
)
 
Total after income taxes
 
 
 
 
 
Prior service credit associated with postretirement plans:
 
 
 
 
Postretirement health care and life insurance benefits
 
$
2.3

 
Net periodic benefit costs, excluding service cost
Defined benefit pension plans
 
(0.1
)
 
Net periodic benefit costs, excluding service cost
 
 
2.2

 
Total before income taxes
 
 
(0.8
)
 
Income tax provision
 
 
$
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 unaudited condensed consolidated statements of operations.