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STOCKHOLDERS' EQUITY: - Non Controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Non-controlling interest activity    
Balance at the beginning of the period $ 41.7 $ 38.6
Net earnings 1.2 0.9
Dividend paid (0.3) (0.2)
Balance at the end of the period $ 42.6 $ 39.3