LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Letters of credit & Surety bonds (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financing Arrangements
Outstanding letters of credit	$ 12.3	$ 12.8
Accounts receivable securitization borrowings
Financing Arrangements
Outstanding letters of credit	11.7	12.2
Surety bonds
Financing Arrangements
Outstanding surety bonds under uncollateralized bond programs	$ 61.7	$ 62.3