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WORKERS' PARTICIPATION: (Tables)
12 Months Ended
Dec. 31, 2019
WORKERS' PARTICIPATION:  
Schedule of workers' participation expense Workers’ participation expense for the three years ended December 31, 2019 was as follows (in millions):

    

2019

    

2018

    

2017

Current

$

188.8

$

219.9

$

192.7

Deferred

 

29.8

 

9.8

 

6.6

$

218.6

$

229.7

$

199.3