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Accounts Payable and Accrued Liabilities (Notes)
 12 Months Ended
Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Abstract]  
Accounts Payable and Accrued Liabilities [Text Block]
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES

Components of accounts payable and accrued liabilities follow (in millions):
 
December 31,
 
2017
 
2016
 
 
 
 
Trade payables
$
6.3

 
$
11.5

Compensation and employee benefits
17.4

 
12.5

Postretirement health and life benefit obligations - current
14.7

 
13.8

Severance
3.9

 
3.4

Current portion of interest on 8.25% Notes
6.1

 
—

Accrued interest on PIK Toggle Notes (cash portion)
0.2

 
1.5

Other accrued liabilities
4.7

 
3.7

 
$
53.3

 
$
46.4