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Supplemental Information (Tables)
 6 Months Ended
Jun. 30, 2019
Supplemental Information [Abstract]  
Other Operating Expense, Net
The components of “Other operating expense, net” for the three month and six month periods ended June 30, 2019 and 2018 were as follows.


  
For the Three
Month Period
Ended
June 30,
    
For the Six
Month Period
Ended
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Other Operating Expense, Net
                        
Foreign currency transaction losses (gains), net
  
$
0.6
    
$
(2.4
)
  
$
3.7
    
$
0.2
  
Restructuring charges, net (1)
    
0.8
      
—
      
2.8
      
—
  
Stock-based compensation(2)
    
7.1
      
(0.8
)
    
16.4
      
1.9
  
Shareholder litigation settlement recoveries(3)
    
—
      
—
      
(6.0
)
    
(4.5
)
Acquisition related expenses and non-cash charges(4)
    
17.1
      
2.9
      
18.7
      
5.9
  
Gains on asset disposals
    
(0.4
)
    
—
      
(0.3
)
    
(1.2
)
Other, net
    
0.1
      
0.9
      
1.1
      
2.6
  
Total other operating expense, net
  
$
25.3
    
$
0.6
    
$
36.4
    
$
4.9
  

(1)
See Note 3 “Restructuring.”


(2)
Represents stock-based compensation expense recognized for the three month and six month periods ended June 30, 2019 of $6.0 million and $13.6 million, respectively, increased by $1.1 million and $2.8 million for the three month and six month periods ended June 30, 2019, respectively, due to costs associated with employer taxes.


Represents stock-based compensation expense recognized for the three month and six month periods ended June 30, 2018 of $1.8 million and $5.2 million, respectively, reduced by a $2.6 million and $3.3 million decrease in the estimated accrual for employer taxes for the three month and six month periods ended June 30, 2018, respectively, as a result of the achievement of employer tax caps in countries outside of the United States.

(3)
Represents an insurance recovery of the Company’s shareholder litigation settlement in 2014.


(4)
Represents costs associated with successful and/or abandoned acquisitions, including third-party expenses, post-closure integration costs (including certain incentive and non-incentive cash compensation costs), and non-cash charges and credits arising from fair value purchase accounting adjustments.