XML 93 R69.htm IDEA: XBRL DOCUMENT v3.10.0.1
Summary of Significant Accounting Policies Discussion Adoption of ASU 2017-07 (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Apr. 01, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Successor                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Operating costs and expenses                     $ 3,052.7 $ 4,072.6  
Selling and administrative expenses                     106.3 158.1  
Net mark-to-market adjustment on actuarially determined liabilities, in Operating Profit                     0.0    
Operating profit (loss)   $ 126.8 $ 130.3 $ 165.3 $ 239.2 $ 301.7 $ 209.5 $ 152.6     663.8 661.6  
Net periodic benefit costs, excluding service cost                     21.9 18.1  
Net mark-to-market adjustment on actuarially determined liabilities   $ 125.5       $ 45.2         (45.2) (125.5)  
Income (loss) from continuing operations before income taxes                     552.1 664.1  
Adjustment                       $ 22.5  
Successor | Operating costs and expenses                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                     (22.8)    
Successor | Selling and administrative expenses                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                     0.9    
Successor | Net mark-to-market adjustment on actuarially determined liabilities, Operating Profit                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                     45.2    
Successor | Operating profit (loss)                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                     (23.3)    
Successor | Net periodic benefit costs, excluding service cost                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                     21.9    
Successor | Net mark-to-market adjustment on actuarially determined liabilities                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                     (45.2)    
Successor | Income (loss) from continuing operations before income taxes                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                     0.0    
Successor | Before Application of Accounting Guidance                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Operating costs and expenses                     3,075.5    
Selling and administrative expenses                     105.4    
Net mark-to-market adjustment on actuarially determined liabilities, in Operating Profit                     (45.2)    
Operating profit (loss)                     687.1    
Net periodic benefit costs, excluding service cost                     0.0    
Net mark-to-market adjustment on actuarially determined liabilities                     0.0    
Income (loss) from continuing operations before income taxes                     $ 552.1    
Predecessor                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Operating costs and expenses                 $ 950.2       $ 4,070.0
Selling and administrative expenses                 36.3       149.4
Operating profit (loss) $ 0.0               212.5 $ 212.5     (219.8)
Net periodic benefit costs, excluding service cost                 14.4       57.1
Net mark-to-market adjustment on actuarially determined liabilities                 0.0       0.0
Income (loss) from continuing operations before income taxes                 (459.3)       (758.3)
Predecessor | Operating costs and expenses                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                 (13.5)       (53.1)
Predecessor | Selling and administrative expenses                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                 (0.9)       (4.0)
Predecessor | Operating profit (loss)                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                 14.4       57.1
Predecessor | Net periodic benefit costs, excluding service cost                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                 14.4       57.1
Predecessor | Income (loss) from continuing operations before income taxes                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Adjustment                 0.0       0.0
Predecessor | Before Application of Accounting Guidance                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Operating costs and expenses                 963.7       4,123.1
Selling and administrative expenses                 37.2       153.4
Operating profit (loss)                 198.1       (276.9)
Net periodic benefit costs, excluding service cost                 0.0       0.0
Income (loss) from continuing operations before income taxes                 $ (459.3)       $ (758.3)