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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party [Abstract]  
Disclosure of Related Party Transactions
The aggregate compensation expenses we recognized under IFRS for our directors and key management team were as follows:
 
Year ended
December 31
 
2015
 
2016
 
2017
Short-term employee benefits and costs
$
6.8

 
$
6.2

 
$
7.5

Post-employment and other long-term benefits
0.5

 
0.4

 
0.6

Stock-based compensation (including DSUs to eligible directors)
16.6

 
12.3

 
12.4

 
$
23.9

 
$
18.9

 
$
20.5