PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased							800.0
Rollforward of common shares issued
Stock Repurchased During Period, Shares		0.6
Payments for Repurchase of Common Stock					$ 100.0	$ 300.0
Rollforward of Share Repurchase Program
Outstanding common stock repurchase authorization, beginning balance		$ 900.0			$ 900.0
Purchase of common stock	$ 0.0	$ (100.0)	$ (199.9)	$ (100.1)
Common Shares Outstanding Rollforward [Abstract]
Common shares outstanding, beginning balance (in shares)		97.2			97.2
Common shares outstanding, ending balance (in shares)	97.3				97.3
Rollforward of common shares held in treasury
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
Preferred Stock, Shares Outstanding							0.0
Common Stock [Member]
Rollforward of common shares issued
Common shares issued, beginning balance (in shares)		97.2			97.2
Commons Stock Issued During Period Shares Employee Stock Plans					0.6
Stock Repurchased and Retired During Period, Shares					(0.5)
Common shares issued, ending balance (in shares)	97.3				97.3
Common Stock, Shares, Issued	97.3	97.2			97.3		97.3
Common Shares Outstanding Rollforward [Abstract]
Commons Stock Issued During Period Shares Employee Stock Plans					0.6
Stock Repurchased and Retired During Period, Shares					(0.5)
Commons Stock Issued During Period Shares Employee Stock Plans					0.6
Rollforward of common shares held in treasury
Stock Repurchased and Retired During Period, Shares					(0.5)