EQUITY - Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Noncontrolling interests	$ 40.5				$ 184.5				$ 40.5	$ 184.5
Net income	$ 158.9	$ 19.4	$ 141.2	$ 1.6	$ 32.9	$ 12.9	$ 167.3	$ (1.0)	321.1	212.1	$ 138.0
Unrealized foreign currency translation adjustment, net of tax									6.3	(44.2)	158.4
Contributions to noncontrolling interests									15.0	23.2	47.4
Noncontrolling Interests [Member]
Class of Stock [Line Items]
Net income									94.4	62.1	37.5
Unrealized foreign currency translation adjustment, net of tax									10.6	3.3	106.4
Contributions to noncontrolling interests									$ 15.0	$ 23.2	$ 47.4