INCOME TAXES - Income Before Income Taxes and Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loss from continuing operations before income taxes:
United States	$ (357.0)	$ (293.0)
Foreign	(103.2)	128.0
Loss from continuing operations before income taxes	(460.2)	(165.0)
Provision for income taxes:
United States federal	143.5	(23.2)
State and local	8.1	7.0
Foreign	7.2	16.4
Total provision for income taxes	158.8	0.2
Current:
United States federal	3.5	5.8
State and local	1.8	(1.8)
Foreign	(2.0)	26.0
Current	3.3	30.0
Deferred:
United States federal	140.1	(29.0)
State and local	6.3	8.8
Foreign	9.1	(9.6)
Deferred	$ 155.5	$ (29.8)