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STOCKHOLDER'S EQUITY: - Non Controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Non-controlling interest activity        
Balance at the beginning of the period     $ 38.6 $ 36.3
Net earnings $ 1.0 $ 0.6 2.6 1.9
Dividend paid     (0.6)  
Balance at the end of the period $ 40.6 $ 38.2 $ 40.6 $ 38.2