LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Letters of credit & Surety bonds (Details) $ in Millions	Mar. 31, 2021 USD ($)
Financing Arrangements
Outstanding letters of credit	$ 12.3
Accounts receivable securitization borrowings
Financing Arrangements
Outstanding letters of credit	11.7
Surety bonds
Financing Arrangements
Outstanding surety bonds under uncollateralized bond programs	$ 61.6