EQUITY - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Oct. 20, 2015	Sep. 10, 2013
Class of Stock [Line Items]
Common Stock, Shares, Issued	188.6			188.3
Treasury Stock, Value	$ 362.6			$ 362.6
Treasury Stock
Class of Stock [Line Items]
Treasury Stock, Shares	4.9		4.9	4.9	4.9
Treasury Stock, Value	$ 362.6		$ 362.6	$ 362.6	$ 362.6
Stock Issued During Period, Shares, Employee Benefit Plan	0.0		0.0
Treasury Stock Reissued at Lower than Repurchase Price	$ 0.0		$ 0.0
Treasury Stock | 2013 Authorization
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 0.4
Treasury Stock | Repurchase Authorization 2013 [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount							$ 500.0
Treasury Stock, Retired, Cost Method, Amount		$ 0.4
Treasury Stock | October 2015 Authorization
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 1,500.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 400.0
Common Stock
Class of Stock [Line Items]
Common Stock, Shares, Issued	188.6		191.6	188.3	191.4
Stock Issued During Period, Shares, Employee Benefit Plan	0.3		0.2