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Other Charges (Tables)
 12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
Disclosure of Detailed Information about Other Operating Expense
 
Year ended
December 31
 
2015
 
2016
 
2017
Restructuring charges (a)
$
23.9

 
$
31.9

 
$
28.9

Asset impairment (b)
12.2

 
—

 
—

Loss (gain) on pension annuity purchase (c)
(0.3
)
 
—

 
1.9

Toronto transition costs (d)
—

 
—

 
1.6

Other (e)
—

 
(6.4
)
 
4.6

 
$
35.8

 
$
25.5

 
$
37.0
Disclosure of Detailed Information about Restructuring and Related Costs
Our restructuring charges were comprised of the following:
 
Year ended
December 31
 
2015
 
2016
 
2017
Cash charges
$
19.5

 
$
10.7

 
$
25.1

Non-cash charges
4.4

 
21.2

 
3.8

 
$
23.9

 
$
31.9

 
$
28.9