EQUITY - Schedule of Stock by Class (Details) - USD ($) shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Class of Stock [Line Items]
Balance as of January 1, 2016	191.4
Balance as of June 30, 2016	189.6
Treasury Stock, Value (Beginning Balance)	$ 362.6
Treasury Stock, Value (Ending Balance)	$ 362.6
Common Stock
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	(2.1)
Balance as of January 1, 2016	191.4	207.2
Stock-based compensation	0.3	0.5
Balance as of June 30, 2016	189.6	207.7
Treasury Stock
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	0.0
Accelerated Share Repurchase	$ 0.0
Treasury Stock, Shares (Beginning Balance)	4.9	4.9
Stock-based compensation	0.0	0.0
Treasury Stock, Shares (Ending Balance)	4.9	4.9
Treasury Stock, Value (Beginning Balance)	$ 362.6	$ 362.6
Treasury Stock Reissued at Lower than Repurchase Price	0.0	0.0
Treasury Stock, Value (Ending Balance)	$ 362.6	$ 362.6