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STOCKHOLDERS' EQUITY: - Non Controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Non-controlling interest activity        
Balance at the beginning of the period     $ 45.4 $ 41.7
Net earnings $ 1.7 $ 1.3 4.7 3.9
Dividend paid     (1.1) (1.2)
Balance at the end of the period $ 49.0 $ 44.4 $ 49.0 $ 44.4