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Other Non-current Assets
 12 Months Ended
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Other Non-current Assets
OTHER NON-CURRENT ASSETS:
 
December 31
 
2017
 
2018
Net pension assets (note 19)
$
62.9

 
$
4.5

Land rights
10.5

 
10.1

Deferred investment costs
3.2

 
2.9

Deferred financing costs
0.7

 
2.1

Other
4.0

 
10.6

 
$
81.3

 
$
30.2