PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Rollforward of common shares issued
Commons Stock Issued During Period Shares Employee Stock Plans	1.6
Stock Repurchased and Retired During Period, Shares	2.1
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.2
Stock Repurchased During Period, Shares	2.2
Rollforward of Share Repurchase Program
Outstanding common stock repurchase authorization, beginning balance		$ 739.5
Purchase of common stock		(298.1)
Outstanding common stock repurchase authorization, ending balance	$ 447.4	$ 447.4
Common Shares Outstanding Rollforward [Abstract]
Common shares outstanding, beginning balance (in shares)		102.7
Commons Stock Issued During Period Shares Employee Stock Plans	1.6
Stock Repurchased and Retired During Period, Shares	2.1
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.2
Restricted Stock Awards And Performance Shares Surrendered		$ 46.5	$ 33.6
Common shares outstanding, ending balance (in shares)	102.1	102.1
Commons Stock Issued During Period Shares Employee Stock Plans	1.6
Rollforward of common shares held in treasury
Restricted Stock Awards And Performance Shares Surrendered	(0.3)
Treasury Stock, Carrying Basis				$ 298.1
Share repurchases unsettled at period end					0.1
Common Stock, Shares Authorized				265.0
Common Stock, Par or Stated Value Per Share				$ 0.10
Preferred Stock, Shares Authorized				30.0
Preferred Stock, Par or Stated Value Per Share				$ 0.10
Stock Repurchased and Retired During Period, Shares	2.1
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.2
Restricted Stock Awards And Performance Shares Surrendered		$ 46.5	$ 33.6
Preferred Stock, Shares Outstanding				0.0
Share repurchases unsettled at period end					$ 6.0
Common Stock [Member]
Rollforward of common shares issued
Common shares issued, beginning balance (in shares)		125.6
Commons Stock Issued During Period Shares Employee Stock Plans	1.6
Stock Repurchased and Retired During Period, Shares	2.1
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.2
Common shares issued, ending balance (in shares)	125.3	125.3
Common Stock, Shares, Issued	125.3	125.6		125.3	125.6
Common Shares Outstanding Rollforward [Abstract]
Commons Stock Issued During Period Shares Employee Stock Plans	1.6
Stock Repurchased and Retired During Period, Shares	2.1
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.2
Commons Stock Issued During Period Shares Employee Stock Plans	1.6
Rollforward of common shares held in treasury
Restricted Stock Awards And Performance Shares Surrendered	0.0
Stock Repurchased and Retired During Period, Shares	2.1
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.2
Treasury Stock, Common [Member]
Rollforward of common shares issued
Commons Stock Issued During Period Shares Employee Stock Plans	0.0
Stock Repurchased and Retired During Period, Shares	0.0
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.0
Common Shares Outstanding Rollforward [Abstract]
Commons Stock Issued During Period Shares Employee Stock Plans	0.0
Stock Repurchased and Retired During Period, Shares	0.0
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.0
Commons Stock Issued During Period Shares Employee Stock Plans	0.0
Rollforward of common shares held in treasury
Common shares held in Treasury, beginning balance (in shares)		(22.9)
Restricted Stock Awards And Performance Shares Surrendered	(0.3)
Common shares held in Treasury, ending balance (in shares)	(23.2)	(23.2)
Treasury Stock, Shares	23.2	22.9		23.2	22.9
Stock Repurchased and Retired During Period, Shares	0.0
Stock Issued During Period, Shares, Conversion of Convertible Securities	0.0