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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Apr. 01, 2017
Dec. 31, 2016
Predecessor      
Accounts payable and accrued expenses [Line Items]      
Trade accounts payable     $ 288.6
Accrued payroll and related benefits     201.2
Other accrued expenses     190.1
Accrued taxes other than income     119.6
Accrued royalties     62.8
Asset retirement obligations, current   $ 31.1 41.0
Income taxes payable     6.2
Accrued interest     1.2
Accrued health care insurance     16.0
Workers' compensation obligations     7.8
Liabilities associated with discontinued operations     55.9
Accounts payable and accrued expenses     $ 990.4
Successor      
Accounts payable and accrued expenses [Line Items]      
Trade accounts payable $ 388.0    
Accrued payroll and related benefits 239.7    
Other accrued expenses 225.3    
Accrued taxes other than income 111.7    
Accrued royalties 67.4    
Asset retirement obligations, current 34.1    
Income taxes payable 20.6    
Accrued interest 15.5    
Accrued health care insurance 10.6    
Workers' compensation obligations 7.6    
Liabilities associated with discontinued operations 70.6    
Accounts payable and accrued expenses $ 1,191.1