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WORKERS' PARTICIPATION: (Tables)
12 Months Ended
Dec. 31, 2017
WORKERS' PARTICIPATION:  
Schedule of workers' participation expense

Workers' participation expense for the three years ended December 31, 2017 was as follows (in millions):

                                                                                                                                                                                    

 

 

2017

 

2016

 

2015

 

Current

 

$

192.7

 

$

131.8

 

$

140.8

 

Deferred

 

 

6.6

 

 

(13.4

)

 

(19.8

)

​  

​  

​  

​  

​  

​  

 

 

$

199.3

 

$

118.4

 

$

121.0

 

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​  

​