FINANCING ARRANGEMENTS (Summary of Liability and Equity Components of Notes, Issuance Costs and Applicable Assumptions Used for Calculation) (Details) $ / shares in Units, $ in Millions			1 Months Ended
	Jul. 28, 2018 USD ($) $ / shares	May 28, 2015 USD ($) $ / shares	Jul. 31, 2018	Jul. 20, 2018 USD ($)
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Initial conversion rate (shares per $1,000 principal amount)		36.2398
Initial conversion price per share | $ / shares		$ 27.5940
Fair value of liability component upon issuance		$ 138.9
Debt Instrument, Measurement Input [Extensible List]		us-gaap:MeasurementInputDiscountRateMember
Fair value measurement level		Level 3
Fair value of embedded equity component upon issuance		$ 33.6
Deferred tax asset effect		16.0
Total issuance cost		4.3
Equity component		1.0
Deferred tax asset effect		$ 0.4
2025 Convertible Notes [Member]
Debt Instrument [Line Items]
Initial conversion rate (shares per $1,000 principal amount)	32.5256		41.3875
Initial conversion price per share | $ / shares	$ 30.7450
Fair value of liability component upon issuance	$ 160.8
Debt Instrument, Measurement Input [Extensible List]	us-gaap:MeasurementInputDiscountRateMember
Fair value measurement level	Level 3
Fair value of embedded equity component upon issuance	$ 69.2
Deferred tax asset effect	17.3
Total issuance cost	7.3			$ 7.3
Equity component	2.2
Deferred tax asset effect	$ 0.5