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STOCKHOLDERS' EQUITY: - Non Controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Non-controlling interest activity        
Balance at the beginning of the period     $ 41.7 $ 38.6
Net earnings $ 1.3 $ 1.0 3.9 2.6
Dividend paid     (1.2) (0.6)
Balance at the end of the period $ 44.4 $ 40.6 $ 44.4 $ 40.6