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Income Taxes Reconciliation of Expected Federal Income Tax Benefit to Income Tax (Benefit) Provision (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Predecessor        
Reconciliation of Expected Feferal Income Tax Benefit to the Company's Income Tax Provision (Benefit) [Line Items]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ (160.8)   $ (265.4) $ (696.6)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (777.2)   2,453.9 452.9
Worthless Partnership Deduction 0.0   (2,204.4) 0.0
Changes In Tax Reserves (9.2)   2.3 (21.4)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount (11.2)   (37.2) (53.7)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount 158.2   27.5 146.5
Effective Income Tax Rate Reconciliation, Tax Credit, Amount (0.1)   (14.2) (15.7)
Remeasurement of foreign taxes 9.4   (2.0) (22.1)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 40.6   (90.2) (20.1)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount 2,130.0   29.6 0.0
Effective Income Tax Rate Reconciliation, Deduction, Amount (1,639.6)   0.0 0.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 0.0 $ 473.5 0.0 0.0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount (3.9)   5.6 23.1
Income Tax (Benefit) Expense $ (263.8)   $ (94.5) $ (207.1)
Successor        
Reconciliation of Expected Feferal Income Tax Benefit to the Company's Income Tax Provision (Benefit) [Line Items]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount   193.2    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   (744.9)    
Worthless Partnership Deduction   0.0    
Changes In Tax Reserves   7.2    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount   (40.4)    
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount   (26.3)    
Effective Income Tax Rate Reconciliation, Tax Credit, Amount   (0.2)    
Remeasurement of foreign taxes   (0.3)    
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount   (3.1)    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount   0.0    
Effective Income Tax Rate Reconciliation, Deduction, Amount   0.0    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount   (19.7)    
Income Tax (Benefit) Expense   $ (161.0)