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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of Other Current Liabilities
($ millions)
2017

 
  2016

 
Long-term compensation liability (1)
17.7

 
—

 
Lease inducement
3.4

 
—

 
Onerous contracts provision
2.9

 
—

 
Decommissioning liability
33.7

 
23.7

 
Other current liabilities
57.7

 
23.7

 
(1)
The current portion of long-term compensation liability relates to the PSU Plan. See Note 22 - "Share-based Compensation" for additional information.