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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, 2018
Dec. 31, 2016
Successor        
Reconciliation of Expected Feferal Income Tax Benefit to the Company's Income Tax Provision (Benefit) [Line Items]        
Expected income tax expense (benefit) at U.S. federal statutory rate   $ 193.2 $ 139.5  
Changes in valuation allowance, income tax   (744.9) (284.6)  
Remeasurement due to the Tax Cuts and Jobs Act   473.5 9.5  
Reorganization costs   0.0 0.0  
Bad debt deduction   0.0 0.0  
Worthless partnership   0.0 0.0  
Changes in tax reserves   7.2 2.1  
Excess depletion   (40.4) (28.5)  
Foreign earnings provision differential   (26.3) 97.1  
Global intangible low-taxed income   0.0 68.2  
Remeasurement of foreign income tax accounts   (0.3) (0.2)  
State income taxes, net of federal tax benefit   (3.1) 3.2  
Other, net   (19.9) 12.1  
Total income tax provision (benefit)   $ (161.0) $ 18.4  
Predecessor        
Reconciliation of Expected Feferal Income Tax Benefit to the Company's Income Tax Provision (Benefit) [Line Items]        
Expected income tax expense (benefit) at U.S. federal statutory rate $ (160.8)     $ (265.4)
Changes in valuation allowance, income tax (777.2)     2,453.9
Remeasurement due to the Tax Cuts and Jobs Act 0.0     0.0
Reorganization costs 2,130.0     29.6
Bad debt deduction (1,639.6)     0.0
Worthless partnership 0.0     (2,204.4)
Changes in tax reserves (9.2)     2.3
Excess depletion (11.2)     (37.2)
Foreign earnings provision differential 158.2     27.5
Global intangible low-taxed income 0.0     0.0
Remeasurement of foreign income tax accounts 9.4     (2.0)
State income taxes, net of federal tax benefit 40.6     (90.2)
Other, net (4.0)     (8.6)
Total income tax provision (benefit) $ (263.8)     $ (94.5)