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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of Other Current Liabilities
($ millions)
2019

 
2018

 
Long-term compensation liability
2.3

 
6.5

 
Lease liability
31.3

 
—

 
Decommissioning liability
35.0

 
26.9

 
Lease inducement (1)
—

 
3.4

 
Onerous contracts provision (1)
—

 
2.6

 
Other current liabilities
68.6

 
39.4

 
(1)
On adoption of IFRS 16 the Company elected to use the practical expedient to apply the previous assessment under IAS 37 for onerous contracts and deferred lease inducements. See Note 4 - "Changes in Accounting Policies" for additional information.