STOCKHOLDERS' EQUITY: - Non Controlling Interest (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Non-controlling interest activity
Balance at the beginning of the period			$ 47.9	$ 45.4
Net earnings	$ 2.1	$ 1.7	4.9	4.7
Dividend paid			(2.8)	(1.1)
Balance at the end of the period	$ 50.0	$ 49.0	$ 50.0	$ 49.0