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Liabilities Subject to Compromise (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Apr. 01, 2017
Fresh-Start Adjustment [Line Items]    
Debt [1]   $ 8,077.4
Interest payable   172.6
Environmental liabilities   61.9
Trade payables   55.2
Postretirement benefit obligations [2]   23.0
Other accrued liabilities   26.6
Liabilities subject to compromise   8,416.7
First Lien, Second Lien And Unsecured Debt    
Fresh-Start Adjustment [Line Items]    
Debt   7,768.3
Prepetition Letters Of Credit | Derivative Contract Termination    
Fresh-Start Adjustment [Line Items]    
Debt   $ 257.3
Prepetition Letters Of Credit | Secured Debt    
Fresh-Start Adjustment [Line Items]    
Debt $ 51.8  
[1] Includes $7,768.3 million of first lien, second lien and unsecured debt, $257.3 million of derivative contract terminations, and $51.8 million of liabilities secured by prepetition letters of credit at April 1, 2017.
[2] Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees.