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Liabilities Subject to Compromise (Details) - USD ($)
$ in Millions
Apr. 01, 2017
Dec. 31, 2016
Fresh-Start Adjustment [Line Items]    
Debt [1] $ 8,077.4 $ 8,080.3
Interest payable 172.6 172.6
Environmental liabilities 61.9 61.9
Trade payables 55.2 58.4
Postretirement benefit obligations [2] 23.0 34.6
Other accrued liabilities 26.6 32.4
Liabilities subject to compromise 8,416.7 8,440.2
First Lien, Second Lien And Unsecured Debt    
Fresh-Start Adjustment [Line Items]    
Debt 7,768.3 7,771.2
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 and $7,771.2 million of first lien, second lien and unsecured debt at April 1, 2017 and December 31, 2016, respectively, and $257.3 million of derivative contract terminations, and $51.8 million of liabilities secured by prepetition letters of credit at April 1, 2017 and December 31, 2016.
[2] Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees.