PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 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
Common stock repurchase average purchase price per share	$ 178.85
Payments for Repurchase of Common Stock	$ 100.0	$ 100.1
Rollforward of Share Repurchase Program
Purchase of common stock	(100.0)	$ (100.1)
Outstanding common stock repurchase authorization, ending balance	$ 900.0
Common Shares Outstanding Rollforward [Abstract]
Common shares outstanding, beginning balance (in shares)	97.2
Common shares outstanding, ending balance (in shares)	97.1
Rollforward of common shares held in treasury
Treasury Stock, Carrying Basis			$ 100.0
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
Commons Stock Issued During Period Shares Employee Stock Plans	0.5
Stock Repurchased and Retired During Period, Shares	(0.6)
Common shares issued, ending balance (in shares)	97.1
Common Stock, Shares, Issued	97.1		97.1
Common Shares Outstanding Rollforward [Abstract]
Commons Stock Issued During Period Shares Employee Stock Plans	0.5
Stock Repurchased and Retired During Period, Shares	(0.6)
Commons Stock Issued During Period Shares Employee Stock Plans	0.5
Rollforward of common shares held in treasury
Stock Repurchased and Retired During Period, Shares	(0.6)