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STOCKHOLDERS' EQUITY: - Non Controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Non-controlling interest activity        
Balance at the beginning of the period     $ 45.4 $ 41.7
Net earnings $ 2.0 $ 1.5 3.0 2.6
Dividend paid     (0.1) (0.9)
Balance at the end of the period $ 48.3 $ 43.4 $ 48.3 $ 43.4