DEBT (Interest Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Cost
Interest cost incurred	$ 493.1	$ 362.9	$ 448.5
Less: Interest capitalized	47.6	40.9	45.3
Interest expense, net	$ 445.5	$ 322.0	$ 403.2