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Accounts Payable and Accrued Liabilities (Notes)
 12 Months Ended
Dec. 31, 2016
Accounts Payable and Accrued Liabilities [Abstract]  
Accounts Payable and Accrued Liabilities [Text Block]
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
 
December 31,
($ millions)
2016
 
2015
 
 
 
 
Trade payables
$
11.5

 
$
5.4

Compensation and employee benefits
12.5

 
19.2

Postretirement health and life benefit obligations - current
13.8

 
5.3

Severance
3.4

 
8.7

Other accrued liabilities
5.2

 
6.2

 
$
46.4

 
$
44.8