FAIR VALUE - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	$ 4.2	$ 4.3
Debt maturing within one year	(30.2)	(1.8)
Long-term debt	(1,566.8)	(1,590.4)
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	4.2	4.3
Debt maturing within one year	(30.2)	(1.8)
Long-term debt	(1,654.7)	(1,748.1)
Foreign exchange forward contracts | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign exchange forward contracts	(24.8)	1.8
Foreign exchange forward contracts | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign exchange forward contracts	$ (24.8)	$ 1.8