XML 85 R72.htm IDEA: XBRL DOCUMENT v3.8.0.1
Accumulated Other Comprehensive Income - Reclassification from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Successor    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating costs and expenses $ (1,057.2)  
Net periodic benefit costs, excluding service cost 4.5  
Selling and administrative expenses (37.0)  
Income tax benefit (provision) (10.1)  
Total after income taxes 208.3  
Successor | Defined benefit pension plans    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net periodic benefit costs, excluding service cost $ (2.3)  
Predecessor    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating costs and expenses   $ (950.2)
Net periodic benefit costs, excluding service cost   14.4
Selling and administrative expenses   (36.3)
Income tax benefit (provision)   (2.2)
Total after income taxes   124.3
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss associated with postretirement plans and workers' compensation obligations    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Insignificant items [1]   2.7
Total before income taxes [1]   (9.1)
Income tax benefit (provision) [1]   3.3
Total after income taxes [1]   (5.8)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Prior service credit associated with postretirement plans    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before income taxes [1]   2.2
Income tax benefit (provision) [1]   (0.8)
Total after income taxes [1]   1.4
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before income taxes   (27.7)
Income tax benefit (provision) [1]   9.1
Total after income taxes   (18.6)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Foreign currency cash flow hedge contracts | Cash flow hedges    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating costs and expenses [1]   (16.6)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Fuel and explosives commodity swaps | Cash flow hedges    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating costs and expenses [1]   (11.0)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Insignificant items | Cash flow hedges    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Insignificant items [1]   (0.1)
Predecessor | Postretirement health care and life insurance benefits | Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss associated with postretirement plans and workers' compensation obligations    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net periodic benefit costs, excluding service cost   5.5
Predecessor | Postretirement health care and life insurance benefits | Reclassification out of Accumulated Other Comprehensive Income | Prior service credit associated with postretirement plans    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net periodic benefit costs, excluding service cost [1]   (2.3)
Predecessor | Defined benefit pension plans    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net periodic benefit costs, excluding service cost   5.7
Predecessor | Defined benefit pension plans | Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss associated with postretirement plans and workers' compensation obligations    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net periodic benefit costs, excluding service cost   6.3
Predecessor | Defined benefit pension plans | Reclassification out of Accumulated Other Comprehensive Income | Prior service credit associated with postretirement plans    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net periodic benefit costs, excluding service cost [1]   $ 0.1
[1] Presented as gains (losses) in the unaudited condensed consolidated statements of operations.