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Financial instruments and concentration of credit risks (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location
The following table summarizes the fair value of the company’s foreign exchange forward contracts as of December 31, 2017 and 2016.
As of December 31,
 
2017

 
2016

Balance Sheet Location
 
 
 
 
Prepaid expenses and other current assets
 
$
4.9

 
$
2.4

Other accrued liabilities
 
1.6

 
1.9

Total fair value
 
$
3.3

0.5

$
0.5
Gains and Losses Recognized on Foreign Exchange Forward Contracts
The following table summarizes the location and amount of gains and losses recognized on foreign exchange forward contracts
for the three years ended December 31, 2017.
Year Ended December 31,
2017

 
2016

 
2015

Statement of Income Location
 
 
 
 
 
Other income (expense), net
$
27.5

 
$
(29.1
)
 
$
15.6