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Financial instruments and concentration of credit risks (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018 and 2017.
As of December 31,
 
2018

 
2017

Balance Sheet Location
 
 
 
 
Prepaid expenses and other current assets
 
$
3.4

 
$
4.9

Other accrued liabilities
 
0.3

 
1.6

Total fair value
 
$
3.1


$
3.3

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, 2018.
Year Ended December 31,
2018

 
2017

 
2016

Statement of Income Location
 
 
 
 
 
Other income (expense), net
$
(14.2
)
 
$
27.5

 
$
(29.1
)