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STOCKHOLDERS' EQUITY: - Non Controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Non-controlling interest activity        
Balance at the beginning of the period     $ 41.7 $ 38.6
Net earnings $ 1.5 $ 0.8 2.6 1.6
Dividend paid     (0.9) (0.3)
Balance at the end of the period $ 43.4 $ 39.9 $ 43.4 $ 39.9