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Accounts Payable and Accrued Liabilities (Notes)
 12 Months Ended
Dec. 31, 2015
Accounts Payable and Accrued Liabilities [Abstract]  
Accounts Payable and Accrued Liabilities [Text Block]
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
 
December 31,
($ millions)
2015
 
2014
 
 
 
 
Trade payables
$
5.4

 
$
10.4

Compensation and benefits
19.2

 
22.4

Severance
8.7

 
2.4

Other accrued liabilities
11.5

 
15.3

 
$
44.8

 
$
50.5