SHORT-TERM DEBT AND LINES OF CREDIT - CREDIT FACILITIES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) extension	Dec. 31, 2020 USD ($)
Short-term borrowings
Available capacity under existing agreements	$ 67.7
Number of extensions available on a credit facility | extension	2
Length of credit facility extension	1 year
Letters of credit
Short-term borrowings
Letters of credit issued inside credit facility	$ 1.3
Commercial paper
Short-term borrowings
Short-term borrowings outstanding	331.0	$ 210.5
Credit facility maturing October 2022
Short-term borrowings
Total short-term credit capacity	$ 400.0