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Other Non-current Assets
 12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
Other Non-current Assets
OTHER NON-CURRENT ASSETS:
 
December 31
 
2016
 
2017
Net pension assets (note 19)
$
71.8

 
$
62.9

Land rights
11.0

 
10.5

Other
5.2

 
7.9

 
$
88.0

 
$
81.3