EQUITY EQUITY - Schedule of Stock by Class (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Class of Stock [Line Items]
Balance as of January 1, 2016	191.4
Balance as of March 31, 2016	191.6
Treasury Stock, Value (Beginning Balance)	$ 362.6
Treasury Stock, Value (Ending Balance)	$ 362.6
Common Stock
Class of Stock [Line Items]
Balance as of January 1, 2016	191.4	207.2
Stock Issued During Period, Shares, Employee Benefit Plan	0.2	0.3
Balance as of March 31, 2016	191.6	207.5
Treasury Stock
Class of Stock [Line Items]
Treasury Stock, Shares (Beginning Balance)	4.9	4.9
Stock Issued During Period, Shares, Employee Benefit Plan	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