PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Stock Repurchased During Period, Shares	0.6
Treasury Stock Acquired, Average Cost Per Share	$ 178.85
Treasury Stock, Carrying Basis	$ 100.0
Common stock, par value per share (in dollars per share)	$ 0.10
Preferred stock, shares authorized (in shares)	30.0
Preferred stock, par value per share (in dollars per share)	$ 0.10
Rollforward of common shares issued [Abstract]
Common shares issued, beginning balance (in shares)	97.2	122.4	125.1
Common stock issued under employee stock plans (in shares)	0.9	1.2	1.6
Common stock issued upon conversion of zero-coupon subordinated notes (in shares)	0.0	0.1	0.0
Common shares repurchased (in shares)	(0.6)	(2.9)	(4.3)
Common shares issued, ending balance (in shares)	97.5	97.2	122.4
Rollforward of common shares held in treasury [Abstract]
Common shares held in treasury, beginning balance	0.0	23.5	23.2
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	0.0	0.1	0.3
Common shares held in treasury, ending balance	0.0	0.0	23.5
Share repurchase program [Abstract]
Purchase of common stock	$ (100.0)	$ (450.0)	$ (700.0)
Outstanding common stock repurchase authorization	$ 800.0
Accumulated Other Comprehensive Earnings [Abstract]
Treasury Stock, Shares, Retired	0.0	(23.6)	0.0
Foreign Currency Translation Adjustments
Foreign Currency Translation Adjustments, balance	$ (21.3)	$ (285.4)	$ (389.8)
Current year adjustments, Foreign Currency Translation Adjustments	264.1	104.4	(176.6)
Tax effect of adjustments, Foreign Currency Translation Adjustments	0.0	0.0
Net Benefit Plan Adjustments
Net Benefit Plan Adjustments, balance	(87.0)	(73.3)
Tax effect of adjustments, Net Benefit Plan Adjustments	12.1	3.7
Net Benefit Plan Adjustments, balance	(140.6)	(87.0)	(73.3)
Accumulated Other Comprehensive Earnings
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	7.2	5.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	7.2	5.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(72.9)	(22.5)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	191.2	81.9
Tax effect of adjustments, Accumulated Other Comprehensive Earnings	12.1	3.7	$ 17.9
Accumulated Other Comprehensive Earnings, balance	$ 161.9	$ 372.4		$ 333.7
Common stock, shares authorized (in shares)	265.0