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Accounts Payable and Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Accounts payable and accrued expenses
Accounts payable and accrued expenses consisted of the following:
 
December 31, 2018
 
December 31, 2017
 
(Dollars in millions)
Trade accounts payable
$
281.7

 
$
388.0

Accrued payroll and related benefits
209.3

 
239.7

Other accrued expenses
184.9

 
197.7

Accrued taxes other than income
111.4

 
111.7

Accrued royalties
52.7

 
67.4

Asset retirement obligations
63.8

 
34.1

Income taxes payable
10.0

 
20.6

Accrued interest
15.7

 
15.5

Accrued health care insurance
10.0

 
10.6

Workers’ compensation obligations
7.0

 
7.6

Intangible take-or-pay contracts
20.3

 
27.6

Liabilities from coal trading activities
1.2

 
11.7

Liabilities associated with discontinued operations
54.0

 
70.6

Accounts payable and accrued expenses
$
1,022.0

 
$
1,202.8